Selenium disulfide shampoo works to treat dandruff or seborrheic dermatitis. Selenium disulfide has anti-seborrheic or anti-bacterial fungal or keratolytic properties. It also inhibits the growth of epidermal cells on the scalp and inhibits nuclear division resulting in a decrease in epidermal cell turnover. In the clinic is often used to treat some common skin diseases, the efficacy of the drug is to remove dandruff or seborrheic dermatitis of the scalp to play an anti-inflammatory role, but also can be used to treat pemphigus foliaceus, which is often referred to as sweat spots. Selenium disulfide should not be used in excess, overuse may cause contact dermatitis or hair discoloration, and may also irritate the skin, causing irreversible damage to the skin. It is prohibited in areas of skin with inflammation, vesicles, oozing and external genital areas. To use, first wash the scalp or hair with shampoo, take 5~10 grams of the liquid, gently rub it on the hair until it foams, wash it off with lukewarm water after 3~5 minutes, and repeat the process once if necessary, which will help to improve the symptoms.