Seborrheic dermatitis Seborrheic dermatitis, common during infancy, is relatively unusual during later childhood. It resurfaces as a problem during adolescence and then seems to become progressively more common through adult life. The adolescent variant primarily involves the scalp, forehead, tarsal margins of the eyelids (blepharitis), ears, and nasolabial folds. Seborrheic dermatitis is easily controlled but not curable. Treatment may consist of the topical application of ketoconazole cream or a mild topical steroid. The frequent use of tar shampoos is particularly helpful in the control of seborrheic dermatitis of the scalp.