Seborrheic dermatitis affects 3-5% of world's adults, mainly scalp and face. Caused by Malassezia furfur fungus feeding on skin oils. More common in men due to male hormones
Malassezia furfur is a natural skin fungus that forms 80% of human skin flora. Colonizes skin surfaces by 3-6 months of life without age or sex predilection. Can become pathogenic when transforming from yeast to hyphae
Malassezia is a normal skin flora yeast that colonizes 30-100% of newborns. Genus consists of 17 species, most prevalent in healthy skin. Species distribution varies by region, with M. sympodialis common in Europe
M. furfur is a normal skin yeast found on scalp, face, chest, and back. Up to 90% of population carries this yeast on their skin. Lipophilic yeast that breaks down skin's natural oil
Papulosquamous disorder affecting sebum-rich areas of scalp, face, and trunk. Ranges from mild dandruff to exfoliative erythroderma. Commonly affects chest area and is aggravated by humidity changes
Common papulo-squamous dermatosis affecting scalp, nose, eyebrows and skin folds. Affects 1-3% of community, especially infants, middle-aged and elderly. More common in men than women across all age groups. Exact cause unknown, but linked to Malassezia fungus