Repeated growth of hardened acne on the chin should be treated under the guidance of a doctor, and attention to daily skin care, diet and lifestyle habits can also help to eliminate acne. Acne should be promptly consulted, diagnosed by a doctor and treated according to the severity of the condition. The principle of treatment is mainly to remove fat, dissolve keratin, sterilize and regulate hormone levels. Commonly used treatments include topical medications, systemic medications, as well as phototherapy and chemical peeling therapy, all of which can eliminate acne with more obvious results. In addition, it can also be regulated by the following aspects: 1. Daily skin care: pay attention to washing your face with water in your life to remove the mixture of oil, dander and bacteria on the skin surface. Do not squeeze or scratch acne with your hands. Don’t use oil and grease, powder skin care cosmetic products and ointments and creams containing glucocorticoid ingredients. 2. Diet: Avoid spicy food as much as possible, control fat and sugar foods, and eat more fresh vegetables, fruits and vitamin-rich foods. 3. Lifestyle: Pay attention to the moderation of labor and leisure, avoid staying up late.