Selenium disulfide lotion has an anti-seborrheic effect and also has some antifungal effect, and is mainly used to remove dandruff, seborrheic dermatitis of the scalp, and lichen planus also known as sweat spots. The use of the drug may cause mild contact dermatitis, dry hair or scalp, hair discoloration, etc. The use of selenium disulfide lotion should be prohibited for skin with inflammation, erosion and oozing areas, and the use of selenium disulfide lotion should be prohibited for the external genital area. Selenium disulfide is a topical drug can not be taken internally, in the process of medication need to pay attention to the dyeing and perming of hair within two days after the use of the drug should not be used, the scalp should be completely rinsed clean after the use of the drug to avoid hair decoloration, the use of the drug site such as burning sensation, redness and swelling should be stopped, and the local drug washed, if necessary, promptly consult a doctor. If you do not see any improvement after 2-3 courses of treatment, please consult your doctor.