Selenium disulfide lotion is irritating and should not be used to wash the face in order to avoid damaging the skin. Selenium disulfide lotion is mainly composed of selenium disulfide, which has antifungal and seborrheic effects and is mainly used for the treatment of seborrheic dermatitis of the scalp, dry seborrhea, lichen planus, acne and other diseases. If you have lichen planus and acne on your face you can use selenium disulfide lotion to spot apply on the affected area, but it should not be used to wash your face directly. The face should be washed with water before use, applied in appropriate amounts according to the area of the affected area, kept for 3-10 minutes and then washed with warm water. If you use selenium disulfide lotion to wash your head, you need to wash your hair and scalp with shampoo first, then take an appropriate amount of selenium disulfide lotion and apply it on the surface of your hair, rub it gently until foam appears, and then wash it with warm water after a few minutes. It should be noted that selenium disulfide lotion should not be used if there is acute inflammation of the skin or if there is erosion and oozing. During the use of the drug site appeared burning sensation, itching, redness and swelling, should immediately stop the drug, if inadvertently into the eyes should be flushed with running water, if the symptoms are more serious should promptly seek medical treatment.