Abstract
AbstractSeborrhoeic dermatitis is a common, chronic, inflammatory dermatosis that has a predilection for the scalp, facial creases and large flexures including the ano‐genital area. It affects adults of all ages and often runs a relapsing course. A short‐lived infantile variant is also recognized. The cause is unclear, but increasing evidence supports a pathogenic role for lipophilicMalasseziayeasts, which comprise part of the normal skin microbiome. Most affected individuals are healthy, but seborrhoeic dermatitis may be a presenting feature of HIV infection, so at‐risk individuals should be tested. Treatment is aimed at reducing scalp yeasts and/or the inflammatory response, with topically applied imidazole antifungal drugs, mild potency corticosteroids and calcineurin antagonists.