Physiological saline on acne can only reduce the redness and oozing of acne, and does not cure it. Acne is caused by Propionibacterium acnes infection and abnormal keratinization of the sebaceous ducts of the hair follicles. Treatment is mainly anti-infection and reduction of abnormal follicular duct keratinization. Saline wet compresses are mainly used to reduce exudation, redness and swelling of the lesions by siphoning. If acne occurs, it is advisable to give peroxybenzoyl gel once in the morning for topical application and adapalene gel once in the evening for topical application for best results. If the redness is obvious, you can first use saline wet compress, after the redness subsides, change to topical medication can be used, usually also need to avoid eating spicy and irritating food, sweets, greasy food.