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Medical editor: Dr Pierre SCHNEIDER, Dermatologist, Saint-Louis Hospital, France.
By
Dr. Pierre Schneider
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The causes of seborrheic dermatitis are multifactorial and involve the interaction of three factors:
In addition to its involvement in the development of seborrheic dermatitis, Malassezia yeast is associated with numerous skin diseases such as pityriasis versicolor and folliculitis3.
A set of arguments identifies sebaceous secretions as participating in the physiopathology of SD:
While these arguments support a role for sebaceous secretions in the development of SD, the details of their involvement remain unknown.
The clinical presentation of seborrheic dermatitis is different in infants and in adults.
Infantile seborrheic dermatitis appears towards the end of the 1st or 2nd month and lasts approximately 4 to 6 months. It appears as squamous erythema or crusty eruptions.
It can present itself:
Non-infiltrated, bilateral and symmetrical erythemato-squamous lesions.
The diagnosis of seborrheic dermatitis is clinical. The most compelling clinical clue is the predominant location of lesions in areas rich in sebaceous glands (face and scalp in particular) as well as the appearance of the lesions and their evolution over time11,18.
Reference: Clark, GW. & Pope, SM. & Jaboori, KA. Diagnosis and treatment of seborrheic dermatitis. Am Fam Physician. 2015 Feb 1;91(3):185-90. PMID: 25822272.
Diaper rash can have several causes. Some of the most common are:
When seborrheic dermatitis is suspected, the therapeutic management is the same as for adults: application of topical antifungals associated with a short treatment of dermocorticoids, if necessary.
Vaseline ointment is indeed recommended for removing cradle cap: apply it to the baby's head in the evening and wash the next day with a mild shampoo. The scales can then be removed more easily.
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