Bioderma Congress Reports ESPD 2022

Speaker: Prof. Uwe Gieler

Report written by Dr. Nives Pustisek

Skin picking in youth – a problem for dermatologists?

Prof. Uwe Gieler (Germany)

Skin picking disorders can be explained as self-infliction with obsessive or impulsive behavior, skin symptoms are visible and evident. The patient is aware of their behavior and open to discussing it. There are no skin sensations (picking without symptoms). The patient has tried to change their behavior several times. Feelings of shame and disgust are present. Skin lesions are mostly localized on face, arms and head. Diagnostic criteria for excoriation (skin picking) disorder can be found in DSM-V (May 2013). Skin picking disorders include iatrogenic excoriation, onychophagia, onychotillomaina, trichotillomania, trichteriromania, nose picking and ear picking, cheek biting (Morcicatio buccarum), lip biting or picking, knuckle cracking behavior. It is important to distinguish skin picking form factitious disorder. Factitious disorder is most often kept secret, the patient will not tell us about the skin manipulation. The skin picking problem is not secret, you can always ask patients are they try to stop. Prevalence of skin picking is about 5,4%. Skin picking can be compulsive or impulsive. It is important to differentiate them because of different treatment options. When the skin picking is impulsive, it is important to clarify impulsive behavior (diary), skills and stopping impulsive picking whereas for obsessive-compulsive skin picking, one should clarify obsessive-compulsive behavior (diary), reduce obsessive picking positive empowerment. Some skin picking treatment skills are to occupy your hands with something else until the urge passes or put on gloves; when tempted to pick, care for your skin instead (for example, apply moisturizer); aim to hold off the urge for longer and longer each time if you can’t resist it altogether; keep skin clean to avoid infections; stay busy; get rid of tweezers, pins and any other instrument you might be tempted to use; try squeezing a soft ball or playing with blue tack instead. At the beginning of the treatment, speak about skin picking as an obsessive-compulsive or impulsive behavior and do not give advice such as just stop the behavior. Habit reversal techniques and several web sites for online therapy of skin picking have been presented.

Speaker: Prof. Rudolf Happle

Report written by Prof. Ivelina Yordanova

On May 20, 2022 in the heart of Bavaria in the cosmopolitan and charming city of Munich, after 2 years of pandemic, a remarkable event the 21st Congress of the European Association of Pediatric Dermatology was opened.

The event was officially opened by the President of the Association Prof. Veronica Kinsler and Prof. Andreas Wollenberg, Chairman of the Local Organizing Committee of the event in Munich.

The fantastic program of the event, which includes 6 plenary lectures and 16 thematic sessions, is scheduled to be presented by the world's leading experts in the world of pediatric dermatology.

The first of the six plenary lectures that opened the program of the scientific meeting was presented by the outstanding Prof. Rudolf Happle. He desided to start with his lecture on Mosaicism.

In his lecture Prof. Happle proposed a new category of cutaneous segmental mosaicism: isolated segmental biallelic monoclonal mosaicism. Prof. Happle said that different forms of cutaneous mosaicism have been delineated In autosomal dominant traits and characterized by multiple skin tumors such as neurofibromatosis 1, orcylindromatosis and other. The disseminated lesions originate from many different postzygotic events of loss of heterozygosity. In simple segmental mosaicism, a very early postzygotic new mutation gives rise to a segmental area that, due to different second hits, will later develop multiple biallelic tumors. In his lecture Prof. Happle draw attention to an unusual further category of segmental biallelic mosaicism that is related to autosomal dominant skin disorders in which the lesions develop as a consequence of two early mutations involving both alleles of a certain gene. This new category always occurs sporadically. Prof. Happle said that he and Prof.

Torello propose to call it ‘isolated segmental biallelic monoclonal mosaicsm’. A telling example is isolated large neurofibroma that is usually of the plexiform type. In general, sizeable tumors of this kind occur in patients with typical features of NF1, and are thus considered as a superimposed mosaic manifestation. Remarkably, however, there are many reports of large sporadic neurofibromas without any additional disseminated lesions of NF1, such as ordinary neurofibromas or café-au-lait macules or axillary freckling, and without any features of NF1 in family members. So far, the sporadic occurrence of such solitary large neurofibromas was difficult to explain. Prof. Happle said he propose that these cases may reflect isolated segmental monoclonal two-hit mosaicism. At an early developmental stage, a postzygotic NF1 mutation may quickly be followed by a second mutational event involving the same cell clone. It is important to realize that the second postzygotic mutational event, resulting in loss of the corresponding wild-type allele, should have occurred before or around the implantation of the blastocyst, because otherwise a segmental manifestation would no longer be possible, as can be concluded from analogous mosaic patterns reflecting X-inactivation. Prof. Happle emphasize the monoclonality of the second hit, which is in contrast to simple segmental mosaicism of biallelic skin disorders such as neurofibromatosis where the clinical lesions tend to originate from many different second hits and are thus derived from different cell clones. The new category should also be distinguished from simple segmental mosaicism of monoallelic skin disorders such as keratinopathic ichthyosis of Brocq and Siemens where the affected mutant cells carry one hit only.

Over and above, somatogonadal mosaicism cannot be excluded in the two other categories. Prof. Happle said these patient bears the risk to give birth to a child with full-blown keratinopathic Ichthyosis of Siemens, because of possibility of gonadosomatic mosaicism. He also presented two similar rare cases of segmental childhood-onset Hailey-Hailey disease and acantholytic epidermal naevus and palmoplantar kerathoderma, as examples for superimposed mosaicism.

Speaker: Dr. Flora B. de Waard-van der Spek

Report written by Dr. Nives Pustisek

Dr. Flora B. de Waard-van der Spek is a Consultant in Pediatric Dermatology in Department of Dermatology, Erasmus University Medical Center Rotterdam and Kinder Haven Havenziekenhuis, Rotterdam, The Netherlands. She is a President of the EAACI Task Force Allergic Contact Dermatitis in Children and President of the Dutch Society for Pediatric Dermatology. Dr. de Waard-van der Spek said that allergic contact dermatitis (ACD) in children is increasing in the last years. It is very important to understand that ACD in young children is not rare, and should always be considered when children with recalcitrant eczema are encountered. he said that sensitization to contact allergens can start in early infancy, when the epidermal barrier is crucial for the development of sensitization and elicitation of ACD. Factors that may influence the onset of sensitization in children are atopic dermatitis, skin barrier defects and intense or repetitive contact with allergens. Allergic contact dermatitis because of haptens in shoes or shin guards should be considered in cases of persistent foot eruptions or sharply defined dermatitis on the lower legs. Clinical polymorphism of contact dermatitis to clothing may cause difficulties in diagnosing textile dermatitis. Toys are another potentially source of hapten exposure in children, especially from toycosmetic products such as perfumes, lipstick and eye shadow. The most frequent contact allergens in children are metals, fragrances, preservatives, neomycin, rubber chemicals and more recently also colourings.

She gave examples of allergic contact dermatitis in young children when their mothers using emollients containing bisabolol and other natural ingredients. She gave an example from her practice of developing allergic contact dermatitis to para-phenylenediamine, used in temporary tattoo dyes in children. She mentioned that as a result of these temporary tattoos, children develop long-term allergic contact dermatitis, which is why we, as doctors, recommend advising parents not to allow temporary tattoos on their children.

Dr. de Waard-van der Spek said that whenever, despite proper treatment of children with atopic dermatitis the rash persists, a patch test should always be done. Children should be patch-tested with a selection of allergens having the highest proportion of positive, relevant patch test reactions. The allergen exposure pattern differs between age groups and adolescents may also be exposed to occupational allergens.

In conclusion Dr. de Waard-van der Spek said, that in the diagnostic process of eczema in children, many products with which children have contact, may develop irritant or allergic contact dermatitis and should be considered.

Speakers: Prof. Judith Fischer and Dr. Juliette Mazereeuw-Hautier

Report written by Prof. Ivelina Yordanova

We attended an update on ichthyosis in a brilliant parallel session 3.

The session was chaired by Dr. Smail Hadj Rabia from the Department of Dermatology of the Hôpital Necker-Enfants Malades, Paris.

Prof. Fischer presented 2 new syndromes from the group of syndromic ichthyosis. SAM syndrome is represented by congenital erythroderma with palmoplantar keratosis (striate, focal and diffuse), hypotrichosis and elevated serum immunoglobulin E. Both autosomal recessive inheritance (with biallelic loss of function mutation) and autosomal dominant inheritance with a heterozygous mutation in the transmembrane domain in DSG1 gene in SAM syndrome, have been established. In autosomal recessive SAM syndrome, desmoglein 1 deficiency leads to severe dermatitis, multiple allergies and metabolic disorders. Prof. Fischer showed a meta-analysis of mutations in the ALOX12B and ALOXE3 genes identified in a large cohort of 224 patients with ichthyosis in 2021. She emphasized the great importance of the lipid synthesis pathway in the stratum corneum and related mutations, as part protective function of the skin. In conclusion, Prof. Fischer emphasized that by 2022 more than 50 phenotypes of ichthyosis are known, 15% of the pathogenesis of which remains unclear. Genetic identification of unknown mutations through the new technology Whole-Genome-Sequencing WGS, which replace the old one WES, is expected. Prof. Fischer said that a new updated and integrative classification of ichthyosis is needed, which combines clinical and genetic features.

After this genetic lecture, Dr. Juliette Mazereeuw-Hautier, dermatologist from Paris focused on the main goals in the management of patients with ichthyosis - improving skin abnormalities, providing psycho-social support, training in therapy, genetic counseling and prevention of complications of the

eyes, ears, pain and itching, skin infections and delays in physical development, vitamin D deficiency, hair and nail abnormalities, excessive reactions to heat and cold. She presented the European Guideline for the Management of Congenital Ichthyosis, published in the British Journal of Dermatology in 2019, 180: 272-281. She emphasizes conventional treatment with emollients, keratolytics, topical and systemic steroids, moist wraps in the most severe cases. Dr Mazereeuw- Hautier also presented some new data from a double-blind, randomized controlled trial of patients with asymptomatic ichthyosis with oral vitamin D versus acitretin, published in the British Journal of Dermatology 2022. This study included 34 patients with various forms of non-syndromic ichthyosis.

No significant differences were found between the 2 arms of treatment at the end of the study in terms of the severity and quality of life of the patients, and no serious side effects were identified. By understanding the pathophysiology of ichthyosis, it is established that targeted anti-inflammatory treatment is also needed. Ichthyosis is no longer considered only a disease of keratinization, but also a disease in which the disrupted skin barrier induces a complex immune response similar to that of atopic dermatitis and psoriasis. The inclusion in the treatment of patients with ichthyosis of biological agents that inhibit key interleukins in atopic dermatitis and psoriasis are promising strategies in the treatment of ichthyosis. There are several publications from 2017 to the present that report that a

large number of ichthyosis has been found to have systemic T-cell activation and Th-17 / Th-22 polarization of patients' blood. There is a strong correlation between the increased genetic expression of the Th-17 pathway and the severity of ichthyosis and cutaneous erythema. Clinical trials are currently underway to treat adult patients with non-syndromic ichthyosis with Interleukin 17 - and Interleukin-12/23 inhibitors. The results are encouraging and the publication is a fact in February 2022 in the journal Archives of Dermatological Research. Gene therapy for ichthyosis is at a very early stage of development. There are two clinical trials in phase ½ for autosomal-recessive congenital ichthyosis (ARCI ichthyosis) due to a mutation in the gene responsible for the synthesis of transglutaminase 1 (TGM1) and Netherton's syndrome (SPINK5 gene). A new replacement therapy with a protease inhibitor, local recombinant alpha1-antitrypsin, has also been reported as a potential treatment for Netherton's syndrome.

Speaker: Dr. Talia Kakourou (Greece)

Report written by Dr. Rémi Maghia

Scabies is transmitted from person to person by direct contact; less frequently via contaminated objects. The parasite dies within 24 to 72 hours outside of a human host.

Animal scabies can only produce temporary eruptions in humans, since their parasites cannot survive in humans.

Prevalence in children is 5 to 10% in developing countries; it is unknown in Western countries.

Clinical manifestations of scabies are a type IV hypersensitivity reaction to the larva, its faeces and its eggs. Pruritus presents 2 to 6 weeks after a primary infestation, and 1 to 3 days after a re-infestation. A vesiculopapular exanthem may occur in children under 2.

Hyperkeratotic crusted scabies, also known as Norwegian scabies, is typically seen in elderly subjects, but it is sometimes observed in children in cases of primary or secondary immune deficiency. It is distinguished by an absence of pruritus, parasitic proliferation, and extremely high contagiousness.

A diagnosis of paediatric scabies is based on the following arguments. Pruritus that does not affect the head, except in newborns and very young children. The classic cutaneous signs and their topography. Direct examination of skin samples obtained by scraping Microscopy: 100% specificity, 40-90% sensitivity. Dermoscopy (flat delta sign marking the parasite’s head at the end of a burrow), videodermoscopy, confocal microscopy, OCT PCR (an article in PLoS Negl Trop Dis 2021).

The BJD 2020 provides consensus criteria for diagnosing scabies with a 3-level classification: A. confirmed scabies, B. clinical scabies, C. suspected scabies.

The differential diagnosis for newborns is: seborrhoeic dermatitis, nummular eczema, AD, infantile acropustulosis. For children: contact dermatitis, AD, viral exanthem, papular urticaria. For scabies nodules: mastocytomas, Langerhans cell histiocytosis.

Treating scabies: European recommendations, JEADV 2017

The recommended treatments are: permethrin cream 5%, oral ivermectin, benzyl benzoate lotion 10 to 25%.

Alternative treatments: malathion in aqueous solution 0.5%, ivermectin lotion 1%, sulphur ointment 6- 33%.

For crusted scabies: topical scabicide daily for 7 days, then 2 x/week and ivermectin on days 1, 2 and   8.

Permethrin is safe for use during pregnancy and breastfeeding; authorised for use in children starting at age 2. Sulphur ointment: authorised for newborns under 2 months. Benzyl benzoate: authorised during pregnancy, may cause skin irritation. Oral ivermectin is contraindicated for children weighing

less than 15 kg and in pregnant or breastfeeding women.

All members of the family must be treated at the same time.

The parasite is destroyed at temperatures above 50°. At the end of treatment, clothes and sheets must be washed at high temperature and ironed with a hot iron, or placed in a plastic bag for at least 3 days. Rugs and carpets must be vacuumed. Pesticide application is not indicated.

And here’s a surprising tip from the speaker! For unshakeable cases, she recommends leaving the house for a long weekend and doing the treatment. By the time the patients come back home, their house will be free of parasites!

Symptoms often persist for 2 weeks after a successful treatment: use medium-strength topical corticosteroids.

Children can go back to school the day after treatment. Classmates and teachers usually don’t need to be treated unless they show symptoms.

If symptoms persist after 3 or 4 weeks, consider: lack of compliance with treatment, re-infection, contact allergy to treatment, psychogenic pruritus, incorrect diagnosis.

Speaker: Prof. Jacob Mashiah (Tel Aviv, Israel)

Report written by Dr. Rémi Maghia

Ringworm is believed to be the most common fungal infection in children, especially for children aged 4 to 7. The fungistatic action of sebum would seem to explain its lower frequency of occurrence after puberty.

Ringworm is more common in boys than in girls, and in immunosuppressed patients as well.

The predominant species type varies by geographical location. For example, T. tonsurans and M. canis predominate in North America, versus M. canis, M. audouini, T. tonsurans, T. violaceum, T. mentagrophytes in Europe. The differences are explained by differences in habits, population movements (immigration, refugees), and locally available treatment options.

The diagnostic techniques are: direct examination, cultures, Wood’s lamp, trichoscopy, and PCR. Fungal culture is the standard with its high specificity and sensitivity, but this technique is slow.

Trichoscopy is a quick, inexpensive method with moderate overall sensitivity and specificity.

The specific trichoscopic signs of ringworm are: comma hairs, corkscrew hairs, Morse code hairs, zigzag hairs, block hairs and i-hairs. The prevalence, sensitivity, specificity, and positive and negative predictive value of all of these signs are well-known. The specificity of these particular signs is very high: 99-100%. It is also known which characteristics are associated with which species. For example, while corkscrew hairs are common to both microsporum and trichophyton species, trichophytic ringworm varieties do not typically present Morse code, zigzag or comma hairs.

We also know that during treatment, certain trichoscopic signs (not all) will have disappeared after 4 weeks, and that after 12 weeks, if the mycological exam is negative, the only remaining trichoscopic signs are perifollicular and/or diffuse desquamation.

“Healthy carriers” show dermatophyte colonisation without symptoms, and are a source of disease transmission. 32% of families with an infected child have at least one healthy carrier. This is especially the case for the anthropophilic species, with a minimal inflammatory response.

Treatments for ringworm include: griseofulvin, terbinafine, itraconazole and fluconazole. Griseofulvin has been the first-line treatment for 40 years. Sensitivity to this drug seems to be declining. Preferred option for microsporum infections.

Terbinafine is the only alternative to griseofulvin approved for ringworm by the FDA (not in France). Preferred option for trichophyton infections.

Itraconazole and fluconazole show increasing evidence of effectiveness, though perhaps less so for fluconazole, and require shorter treatments than with griseofulvin.

Topical treatments should only be considered as secondary treatments. Shampoos containing ketoconazole, selenium disulphide, or zinc pyrithione can be used to reduce systemic treatments or to treat healthy carriers.

Complementary measures

School attendance: a child with a combined treatment can return to school the next day, though some say a week when an anthropophilic species is involved.

Shaving the scalp: not required if topical treatment is used.

Family screening: systemic treatment if clinical symptoms are identified, antifungal shampoos in case of asymptomatic contact.

Decontamination of objects in the home (combs, toys, pets in case of a zoophilic species)

Speaker: Dr. Secil Vural (Turkey)

Report written by Dr. Rémi Maghia

Author’s note: There wasn’t really any paediatric angle to this presentation.

There are over 20 different species of Leishmania, including tropica, major, infantum, braziliensis, mexicana, guyanensis, panamensis.

12 million patients are infected worldwide, with over a million new patients every year from 100 endemic countries. Worldwide, 350 million people are at risk of infection, and as a result of climate change, the endemic zones are likely to expand due to the geographic expansion of sand flies.

The shared clinical presentation: first a papule at the site of the bite a few weeks or months later. Then spontaneous healing after 3 to 8 weeks, leaving an atrophic scar. The lesions occupy uncovered skin areas: centre of the face, extremities. In endemic zones, children are most commonly affected.

Development of CL: Acute CL can heal spontaneously with a scar, or without a scar when treated.

Chronic CL can develop into recurring CL in 2 to 5% of cases, into a anergic diffuse form (no healing) in 5 to 10% of cases. Or into lupoid CL (partial healing).

In cases of acute CL, the typical development of the lesion is an initial papule, then a painless nodule with a scab, then an ulceration, then healing with an atrophic scar. Healing time varies from 6 to 15 months for L. tropica to 2 to 6 months for L. major.

Recurring CL presents with new papular lesions during or after the healing process of an acute CL. The lesions may persist individually or coalesce over a period of several years.

Chronic CL: the initial lesions do not improve, persist without ulceration, and are resistant to treatment. There is a deficiency in cellular immunity. Clinically and histologically, it may resemble lupus vulgaris.

Diffuse CL: related to immunodepression, and may resemble lepromatous leprosy. Mucocutaneous leishmaniasis is caused by certain species (“L. braziliensis complex”). It is characterised by the destruction of the lips, palate, nasal septum and can result in death.

Diagnosis is performed by directly looking for the parasite in a skin sample taken from the border of the lesion (site of activity). PCR is currently the preferred diagnostic test: 54 to 99% sensitivity with a possibility of diagnosing the species. Culture in a special medium is also possible.

Treatments:

• Pentavalent antimonials, systemic or locally injected.
• Amphotericin B liposomal: effectiveness, no resistance observed, monitoring of renal and cardiac function. Expensive, unfortunately…
• Miltefosine: a promising drug for this indication. Low-level side effects: digestive effects, increased creatinine levels.
• Pentamidine
• Others: fluconazole, aminosidine, ketoconazole, itraconazole, terbinafine, azithromycin, zinc, rifampicin
• Cryotherapy: 1x/week, two cycles of freezing for 10 to 20 seconds, 2 mm of freezing of the healthy peripheral zone. High relapse rate. But combining with injections of antimonials increases effectiveness. Problems with scarring.

Monitoring therapeutic response: a 2/3 decrease in lesion size after 6 weeks is considered as a response to treatment, whereas a decrease of < 1/3 indicates changing to a different treatment. Post-treatment monitoring: every 3 months for a year to watch for possible recurrence. For L. braziliensis: after one year, annual follow-ups for 10 years.

Speaker: Dr. Ramon Grimalt (Spain)

Report written by Dr. Rémi Maghia

The most common nail anomalies in children are:

Before 2 years of age: onychoschizia and leukonychia. After 2 years of age: leukonychia and onychophagia.

Onychoschizia is the second most frequent nail anomaly. It involves splitting of the free edge of the distal nail plate into layers. This phenomenon is very commonly seen on the thumbs and great toes. While the aetiology is not precisely known, repeated trauma, frequent baths and use of solvents have been suggested as predisposing factors.

Leukonychia can be seen in the form of longitudinal white striations or white spots on fingernails or toenails. There are multiple causes.

Onychophagia

A distinction is made between onychophagia (nail biting) and onychotillomania (compulsive destruction of the nails), which are common in childhood. Incidence is 28 to 33% in children between 7 and 10 years old. Onychophagia should not be considered merely a cosmetic problem. A 2014 study that evaluated 450 children with a history of onychophagia showed that 75% of them had attention deficit and hyperactivity disorders.

Infections

Viral (warts, periungual and especially subungual, making treatment difficult), bacterial, fungal.

Systemic diseases

Capillaroscopy can be a great help: though not very specific, it can provide an early sign of systemic disease.

Genodermatoses

• Pure ectodermal dysplasia.
• Congenital pachyonychia.
• Congenital malalignment of the great toenails.

Terry’s nails

Diffuse leukonychia with “ground glass” appearance, described by Terry in 1954, associated with a diagnosis of hepatic cirrhosis in 82 out of 100 patients. Other associations were later described by Holzberg et al.: chronic congestive heart failure, diabetes. These authors also conclude that young patients with this nail anomaly have an increased risk of systemic disease. Recently, Fawcett linked Terry’s nails to hyperthyroidism.

Differential diagnosis of Terry’s nails includes comparison with Lindsay’s nails (half-and-half nails), associated with chronic kidney disease, and Muehrcke’s nails, associated with severe hypoalbuminaemia or in cases of antineoplastic drugs.

Traumas

Haemosiderin and melanin can have exactly the same appearance!

Psoriasis

These anomalies are numerous and well-known, and diagnosis is made easier if psoriasis lesions are detected elsewhere; in particular, remember to examine the scalp.

Alopecia areata

The prevalence of nail anomalies in children with alopecia areata was assessed at 46% (126/272) by Tosti et al. The start of nail symptoms may precede or follow the hair loss.

The nail changes are: very regular and superficial pitting, punctate leukonychia, trachyonychia/twenty- nail dystrophy: 12% of children (Tosti).

Speaker: Dr. Zsuzsanna Szalai (Hungary)

Report written by Dr. Rémi Maghia

With such a broad topic, it's impossible to be exhaustive. Here are a few selected excerpts, grouped by category.

I/ Skin as a sign of systemic disease

New eruptions

An unusual eruption, or one that does not respond to treatment or is accompanied by fever, joint or muscle pain, or other symptoms may indicate an internal problem or an infection. For example:

• Necrolytic acral erythema as a marker of hepatitis C.
• Dermatomyositis, which is a sign of internal cancer, e.g. ovarian cancer, in 20% of adult cases.

New “bulges”

• Eruptive xanthomas: may indicate elevated triglyceride levels, or may be a sign of uncontrolled diabetes.
• Eruptive xanthogranulomas: may reveal haematological disorders.
• Tumour progression.

Colour changes

• Yellowing of the skin may be a sign of liver disease.
• Darkening in folds or in exposed areas, joints, or old scars may be a sign of adrenal disease, such as Addison’s disease.
• Acanthosis nigricans can reveal the start of diabetes or be a sign of an internal cancerous tumour.

Changes in texture

Can be a sign of:

• Lymphoma
• Multiple myeloma
• Complement deficiency or amyloidosis.

II/ Skin and cancer

• Multiple eruptive seborrhoeic keratoses (sign of Leser-Trélat): may reveal an internal cancer (adenocarcinoma), but beware of overdiagnosis.
• Acute febrile neutrophilic dermatosis (Sweet’s syndrome), sometimes associated with haematologic cancer.
• Acquired ichthyosis or acquired pruritus which may indicate an occult cancer, often lymphoma.
• Paraneoplastic pemphigus: has been associated with various cancers, including leukaemias.
• Carcinoid syndrome: flushes and erythema on the neck in relation to a carcinoid tumour.
• Erythema gyratum repens: a very rare eruption associated with various cancers.

III/ Skin and endocrinopathy

• Hypo- or hyperthyroidism: may affect hair, nails and skin.
• Cushing syndrome: stretch marks, moon face, skin fragility.
• Addison’s disease: hyperpigmentation.

IV/ Skin signs of deficiencies

Periorificial and alopecia signs of acrodermatitis enteropathica are the iconic example, with a clear therapeutic test via zinc supplements which yield “dramatic” improvement of symptoms within a few days.

V/ Cutaneous signs of autoimmune diseases

The typical “raccoon-eye” appearance of facial erythema in neonatal lupus erythematosus

Speaker: Prof. Stephanie Christen-Zäch (Switzerland)

Report written by Dr. Rémi Maghia

Urticaria and angiooedema have numerous aetiologies: infectious, allergic, pseudo-allergic, physical, toxic, cholinergic, endogenous (autoimmune, autoinflammatory, endocrine, haematologic), and idiopathic.

If the angiooedema is isolated: C1 esterase deficiency, ACE use, hereditary bradykinin-mediated angiooedema.

Clinically, the classic form presents with areas of vasoconstriction around papular lesions, otherwise as shaped elements or dermographism, or as diffuse small papules in case of cholinergic urticaria. The particular form seen in babies is giant hives, which may have a haematic element such as ecchymoses, not to be confused with serum sickness. The hands and feet are often affected.

The following are not considered to be subtypes of urticaria: urticarial vasculitis (unchanging), serum sickness, acute haemorrhagic oedema of infancy, maculopapular cutaneous mastocytosis, autoinflammatory syndromes.

Distinctions are made between:

• Acute urticaria < 6 weeks: frequent in children, parainfectious, allergic or pseudo-allergic.
• Chronic urticaria > 6 weeks. Prevalence from 0.5% to 1.5% in children.
• Spontaneous urticaria: no triggering factor.
• Inducible urticaria: specific inducing factor.

The subtypes of chronic urticaria are:

• Spontaneous chronic urticaria (SCU), with known or unknown causes.
• Chronic inducible urticaria, triggered by different types of causes:

1. Physical: cold, delayed reaction to pressure, heat, sun, dermographic, vibration
2. Others: Aquagenic, cholinergic, contact

Duration of SCU: most commonly 1 to 5 years: 50% improve within 6 months, 20% within 3 years from the start.

The analysis does not need to be exhaustive and expensive: take the patient’s history and clinical exam into account. One exception: if there is a suspicion of type 1 food allergy or in the presence of triggering factors such as NSAIDs.

Pharmacological treatment of SCU

First line: Second-generation H1 blocker at standard dose

Continue for a few weeks after resolution, gradually decrease to determine whether maintenance treatment needs to be continued.

Second-generation H1 blocker used in paediatrics are: cetirizine, levocetirizine, loratadine, desloratadine, fexofenadine, rupatadine, bilastine.

Second line: if inadequately controlled after 2 to 4 weeks, or even earlier if symptoms are intolerable: increase dose up to x4.

Third line: add omalizumab, which is approved for children > 12 years old with CU, and for children with asthma from age 6.

Fourth line: if inadequate response at 6 weeks: cyclosporin, with the caveat that this treatment cannot be continued in light of the possible renal consequences.

Other therapeutic options: montelukast (leukotriene inhibitor), ranitidine (H2 blocker), doxepin (tricyclic antidepressant), systemic corticosteroids limited to 10 days for severe acute reactions; cease all use of aspirin and NSAIDs, which are exacerbating factors for CU

Speaker: Prof. Christine Bodemer (France)

Report written by Dr. Rémi Maghia

Mastocytoses result from an abnormal clonal accumulation of mast cells in at least one type of tissue (skin, digestive tract, liver, bone marrow, etc.). The release of mediators induces a mast cell activation syndrome (MCAS) consisting of urticaria, flushing, abdominal pain, diarrhoea, headache, bone pain, etc.

In children, spontaneous regression of the disease is typical, in contrast to adults in which there are non-regressive lesions and frequent systemic forms.

Somatic gain-of-function mutations are identified in 85% of paediatric mastocytoses. The D816V mutation of the KIT gene is found in only 42% of cases in children, in contrast to what is seen in adults (90%). The physiopathological role of this mutation is not yet entirely clear.

Sporadic forms (acquired mutations) are far more numerous than familial forms; less than 150 familial cases have been reported, of which only 13 had a germline KIT mutation (and never D816V).

The skin lesions specific to cutaneous mastocytosis (CM) are:

• Maculopapular CM (MPCM): can have large lesions or small lesions.
• Mastocytoma: nodular lesion.
• Diffuse CM (DCM).

MPCM (70 to 80%) occurs before the age of 2, and shows macular or papular lesions that are red/brown in colour (cf. “urticaria pigmentosa”). It is more or less diffuse, located mainly on the trunk and limbs. The scalp may be affected; in addition, the presence of blisters on the scalp at birth should point us to this diagnosis.

Mastoctyoma (10 to 20%): present mainly at birth or before 3 months. Brownish nodular lesion, most commonly just one and of variable size. There are frequent recurrences of blisters or superficial desquamation.

Diffuse CM (5%): neonatal occurrence, firm diffuse infiltration, bullous haemorrhagic detachments, “orange peel” appearance. Systemic risk, especially neonatal anaphylaxis.

Diagnosing paediatric CM

1. Clinical signs. Positive Darier’s sign.
2. Skin biopsy: very useful in unclear cases (Giemsa and c-KIT).
3. Blood tryptase level (not systematically used for diagnosis). A high level is not always associated with the systemic forms, and is correlated with the skin surface involved.
4. Check for c-KIT mutation? (This is not a prognostic factor for regression.)

Progression

• Regression is spontaneous in over 80% of cases, most often around the age of 6. Rarely seen: fatal progression or progression to an aggressive form and/or a sarcoma.
• Note that progression of MCAS reactions and regression of skin lesions do not always occur at the same time.

Treating paediatric CM

• Do not treat in all cases: important to reassure parents because this is a benign disease in over 99% of cases.
• Avoid factors that induce MCAS: physical factors, drugs (aspirin, codeine, morphine, NSAIDs).
• Diet only if justified.
• Anticipate anaphylaxis: in case of general anaesthesia (for the patient’s entire life).
• Provide a specific emergency card.
• If history of anaphylaxis or DCM: prescribe self-injectable adrenaline.
• Vaccinations: provide as normal if there has not been any serious anaphylaxis.
• Follow-up: every 6 months initially, then once a year. Monitor growth, presence of diarrhoea, flush, pruritus, dizzy spells…
• Tests (blood, imaging): depending on clinical signs.

Symptomatic treatments, in progressive lines:

• Topical corticosteroids (pruritus)
• H1 antagonists (pruritus)
• H2 antagonists: heartburn, diarrhoea, food reactions
• Combination of H1 and H2 antagonists
• Leukotriene receptor antagonist: montelukast
• Omalizumab
• Severe MCAS: combined treatments

In cases of diffuse blistering, systemic forms

• Corticosteroids: 0.5 to 1 mg/kg/day for a short period
• Imatinib in case of “paediatric” mutations
• Sirolimus in case of D816 mutation

Speaker: Dr. Anne-Sofie Halling (Denmark)

Report written by Dr. Rémi Maghia

The Danish patient register is known as a veritable treasure trove of raw patient data, and one that has given rise to numerous studies and articles in the medical and dermatological literature.

The Danish system includes multiple specific registers with data on the following areas: education, psychiatric illnesses, prescriptions, health care services, diabetes, cancer, causes of death, medical records of birth, income, and medical databases. The registers are interconnected, with a unique number assigned to each citizen across all of these public registers.

With regard to paediatrics, every Danish child up to age 18 is listed in the Danish National Patient

Registry. Statistics can be compiled by comparing the subjects being studied with controls matched to them by sex and age. The Cox regression model is used to calculate the hazard ratio.

The variables considered in the statistical models are age, sex, relevant comorbidities, medications, and socioeconomic status.

Danish study of comorbidities of atopic dermatitis (AD)

1) One out of every 4 children with AD has asthma (pooled OR: 2.78, 95% CI 2.5-3.1)

2) Children with AD have more severe asthma: we have figures for children with AD, and figures for children with AD + asthma, compared to the children in the general population, including those with asthma. Statistics were compiled on items like hospitalisations, asthma drugs, and use of corticosteroids, with significant ORs (between 1.3 and 2.58) and adjusted ORs (between 1.31 and 2.21).

3) Children with AD are more often hospitalised with extracutaneous infections: upper and lower respiratory tract, gastrointestinal, urinary tract, musculoskeletal, central nervous system, heart, and sepsis (all ORs are greater than 1). That being said, these figures need to be interpreted in detail, e.g. for the question of biotherapies or immunosuppressors that may promote infections.

4) The “psychiatric process” of children with AD

Here again, 14,283 children with AD were compared with 142,830 reference children. ORs were calculated on the basis of raw data, adjusted data, and data adjusted for atopic comorbidities. The items studied were: antidepressants, anxiolytics, centrally acting sympathomimetics, psychiatric consultations, and psychological consultations.

5) Drug prescriptions in children with AD

Here, a comparison of children with AD and adults with AD was performed for the following items: all topical corticosteroids combined, or separately for low, medium, high and very high potency topical corticosteroids and systemic corticosteroids. As a side note, we see in general that adults more frequently receive the highest-potency treatments.

6) Prescriptions: One out of three prescriptions was never picked up at the pharmacist’s!

7) Corticophobia in the parents of 3,437 children with AD:

In this case, a questionnaire was sent out via email. A high rate of corticophobia (TOPICOP score) was significantly associated with: low level of parental education, low total income, absence of AD in the mother, longer time between the first AD outbreak and the start of local corticosteroid therapy.

8) Corticophobia is real issue in the medical profession, and the score in that population is higher than with patients!

The highest corticophobia scores were found among pharmacists, then general practitioners, then paediatricians, then dermatologists