Prevents seborrheic dermatitis of the scalp. SELENIUM SULFIDE (se LEE nee um suhl fahyd) skin lotion is used to treat dandruff-like conditions, seborrhea, and psoriasis. It is also used to treat some fungal infections of the skin. This medicine is for external use only. Do not take by mouth. Shake well before using. Follow the directions on the prescription label. Wash your hands before and after use. Do not get this medicine in the eyes. If you do, rinse the eyes out with plenty of cool tap water. Avoid use of this medicine in the genital area. Do not use on inflamed or broken skin.