If acne keeps growing over and over again, it is recommended to improve bad habits, go to the hospital and use the right medication or treat it through physical therapy. 1. Improve bad habits: It is recommended to reduce the intake of greasy, stimulating, sweet food, regular work and rest, avoid staying up late. 2. Topical medication: you can use topical retinoic acid ointment, adapalene gel, benzoyl peroxide and other medications. When the inflammatory reaction is obvious, oral doxycycline, minocycline and other antibiotic drugs, which have the effect of killing Propionibacterium acnes and anti-inflammatory. Severe acne requires oral isotretinoin and other drugs. 3. Physical therapy: mild to moderate acne can be combined with physical therapy, such as red and blue light irradiation, to inhibit sebum secretion and kill Propionibacterium acnes. The recurrence of acne is recommended to go to the dermatology department of the hospital in a timely manner, combined with the doctor’s advice on treatment, the specific use of drugs need to follow the doctor’s advice.