Acne, also known as pimples and acne, occurs in adolescents, especially in adolescents of both sexes. The causes of the disease are complex, and are related to endocrine, sebaceous gland duct keratinization, microbial infection, immunological factors, diet and so on. The disease occurs in adolescent men and women, and men and women in this period are very conscious of their image, so once the face full of acne will have a lot of psychological problems. Many patients do not get acne when they take medication, but once they stop taking the medication, they will have a relapse. How to prevent acne? 1, pay attention to a light diet, do not eat spicy and sweet food. Because spicy food is easy to produce internal heat, prompting acne, while sweet food can increase the secretion of facial oil, oil secretion will block the pores, resulting in acne. 2, do not stay up late, pay attention to rest. We found that staying up late will increase the secretion of facial oil, once the pores are blocked, it will produce acne bacillus, so try not to stay up late, more rest. 3, to be in a relaxed mood. According to Chinese medicine, depression can cause liver qi to accumulate, and liver depression can turn into fire, generating heat and toxicity, which can occur in the face and grow acne. 4, to keep the bowels open. 5, women should be regular menstruation. Therefore, this requires women to control their diet and emotions in all aspects, so that acne does not worsen before menstruation. I believe that as long as patients can follow the above methods of prevention, or treatment to pay attention to some of the above, then acne will stay away from us or will not be easy to recur, so that our youth without blemishes, away from acne.