Seborrhea: A chronic inflammatory disease of the skin characterized by the accumulation of scales of greasy skin. There may be yellow crusted plaques that are itchy. Seborrhea often affects the scalp. Other sites include the face, ears, eyebrows and eyelids, umbilicus, and genitalia, Seborrhea of the scalp is commonly known as dandruff.
Treatment is with frequent use of dandruff shampoos and topical steroids if necessary. Also called seborrheic dermatitis.