Closed-jaw acne is a type of acne manifestation, mainly related to the proliferation of Propionibacterium, excessive sebum secretion, abnormal sebaceous duct keratinization and immune imbalance. Long-term external use of cosmetics or unreasonable makeup removal leading to barrier damage are also common triggering factors. To get rid of closed mouth acne on the chin, it is mainly necessary to keep the face clean. If there are more acne or it is difficult to eliminate, medication or medical aesthetic methods can be applied: 1. Facial cleansing: cleansing is the most basic skin care step that helps to control the continued development of closed mouth acne. Remember to remove makeup after using cosmetics and cleanse your face with mild cleansing products, not harsh soaps or other alkaline cleansing products. It is recommended to use warm water to cleanse the face, because cold water is not easy to remove oil, while hot water is easy to promote sebum secretion and at the same time has a certain degree of irritation to the skin; 2. Abnormal keratinization, but also available vitamin A acid drugs to inhibit sebum secretion and counteract keratinization, and can be combined with fusidic acid or erythromycin ointment. New supramolecular salicylic acid can clean the surface of dry and aging keratin, clean up blocked pores and tone the skin; 4. Medical cosmetic: such as carbon dioxide laser thermal effect, extruding lipid plugs by high temperature vaporizing tissue, micro-needling can unblock hair follicles, a few patients will have acne breakouts. Microdermabrasion is a physical method to make closed acne into open acne, and then suck away the acne contents through negative pressure.