Acne in dermatology generally refers to acne, which is the skin inflammatory reaction caused by propionibacterium acnes infection, excessive sebum, hair follicle obstruction and other factors. Patients can increase the frequency of washing face at ordinary times to remove excess sebum, which can prevent acne to a certain extent; For acne that has already occurred, do not squeeze it with your hands, but use antibiotics and benzoyl peroxide externally, which can play an antibacterial, acne dissolving and astringent role. Acne is unavoidable for young people and other groups with strong metabolism, but it can be reduced to a certain extent by doing a good job of prevention at ordinary times, such as washing your face frequently to remove excess oil from your skin, eating less irritating food, and reducing the number of times you stay up late.