The excess, rich sebum production in seborrheic dermatitis constitutes a favorable medium for skin flora to multiply. Yeast Pityrosporon ovale (also called Malassezia furfur) has been shown to increase in numbers with the intensity of seborrheic dermatitis. This excessive yeast proliferation worsens the irritation and inflammation. Although all this inflammation does not directly attack the hair follicle, if hair follicles are in the vicinity of the inflammatory cells then they can still be adversely affected. Thus seborrheic dermatitis may non-specifically cause diffuse hair loss. This hair loss should be reversible with treatment of the inflammation.