Seborrheic dermatitis is strongly associated with the proliferation of lipophilic yeasts belonging to the *Malassezia* genus (formerly *Pityrosporum ovale*). While these yeasts are part of the normal skin flora, an overgrowth, possibly due to altered host immune response or sebum composition, is believed to trigger the inflammatory reaction. *Staphylococcus aureus* is associated with impetigo and folliculitis. *Propionibacterium acnes* (now *Cutibacterium acnes*) is involved in acne vulgaris. *Candida albicans* causes candidiasis.
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