For the phenomenon of chin pimples closed mouth, usually referred to as closed mouth pimples, is a type of acne. It can be relieved through the use of retinoic acid cream, benzoyl peroxide, chemotherapy and so on. 1. Retinoic acid cream: commonly used drugs include adapalene gel, etc. Patients can use retinoic acid cream externally, thus regulating the cell differentiation of epidermal stratum corneum formation, improving the keratinization of follicular sebaceous gland ducts, and also dissolving microcomedones, which is a better therapeutic effect. 2. Benzoyl peroxide: It can play the role of killing Propionibacterium acnes, because the cause of closed mouth acne is related to Propionibacterium acnes infection, so it can be achieved by choosing benzoyl peroxide to dissolve microcomedones and astringent effect. 3. Chemical treatment: fruit acid skin resurfacing in the treatment of closed mouth acne, but also achieved better results, because fruit acid can interfere with the binding force of the cell surface, accelerate the shedding and renewal of epidermal cells, for mild acne can play a good therapeutic effect. After the appearance of chin long closed mouth acne, it is recommended to consult a doctor in time, cooperate with the doctor for standardized treatment, follow the doctor’s prescription medication, do not self-medication.