She notes that while seborrheic dermatitis most frequently affects the scalp, "it can also affect areas like the eyebrows, behind the ears, the sides of the nose and the chest." "Dandruff is ...

Experts believe seborrheic dermatitis may relate to an overgrowth of Malassezia yeast on the scalp. Shampoos with antifungal agents like ketoconazole, selenium sulfide, and zinc pyrithione can help.