Closed-mouth acne has been growing on the chin, and it is considered to be related to improper cleansing, poor lifestyle and dietary habits, and sebaceous gland secretion and discharge disorders. It can be treated by removing triggers, topical medication and physical methods. 1. Remove the cause: chin has been long closed mouth acne, need to clarify the cause, may be and usually often eat high fat and greasy food, so to change the diet, try to eat a light diet, and at the same time to do a good job of skin cleaning, develop good work and rest habits, after removing the cause, you can improve the symptoms of closed mouth acne. 2. Topical medication: when the chin has been long closed mouth acne, you can cooperate with the doctor to apply topical tazarotene gel, adapalene gel and other medication, these drugs can effectively promote the acne discharge, thereby improving the patient’s symptoms. 3. Physical methods: can also be fruit acid peeling treatment, mainly the use of fruit acid drugs, to promote the local skin stratum corneum off, so as to improve the symptoms of closed mouth acne. It is recommended that patients go to the hospital in a timely manner, under the guidance of the doctor standardized treatment. The medication should be used in accordance with the doctor’s instructions, do not self-medication.