Acne is a common disease of adolescence. Some people only have a few pimples on the forehead and cheeks, while others and up very heavy, with multiple facial pimples, red bumps, pustules, cysts and scars. For moderate to severe acne should be actively treated to avoid scarring, in addition to drug treatment, acne prevention is very important. 1. A regular diet with sleep is important to avoid acne; 2. Reducing stress and relaxing is equally important; 3. Eating a light diet and avoiding too much greasy food; 4. Maintaining good skin care habits. Patients with acne should clean their faces every night to facilitate cortical secretion, but they should not wash excessively. Repeated washing will stimulate excessive cortical secretion and cause acne to worsen. Repeated cleaning will also cause the skin to become thinner, which will easily v cause facial allergies.