Classification and treatment of acne (acne, acne, acne) In order to choose the most suitable treatment scheme, acne is divided into light, medium and heavy grades. Mild (Grade I): The lesions are mainly acne, with a small number of papules and pustules, and the total number of lesions does not exceed 30. Shi Xuebo (Grade II), Department of Dermatology and Sexology, Second People's Hospital of Changshu City: There are acne with moderate papules and pustules, and the total number of skin lesions is between 3 1-50. Moderate (Grade III): acne, accompanied by a large number of papules and pustules, occasionally large inflammatory lesions, widely distributed, the total number of lesions is 5 1 ~ 100, with a few nodules. Severity (Grade IV): In addition to the above rash, there are nodules and cysts, most of which are painful and form cysts, and there are more than three nodules and cysts. Choice of treatment (1) Mild acne (Grade I): The treatment is mainly to eliminate acne. Secondly, it aims at a few inflammatory papules to achieve the purpose of degreasing. Mainly for external use, oral tetracycline or doxycycline. In order to prevent recurrence, after the lesions completely subside, anti-keratotic drugs can be often used for maintenance treatment for 4 ~ 6 months. (2) Moderate acne (Grade II ~ III): The treatment is mainly to eliminate acne, and to remove sebum for most inflammatory papules, and the course of treatment is appropriately prolonged. The course of treatment is generally 6 ~ 12 weeks, and the treatment is maintained for 4 ~ 6 months according to the condition. (3) Severe (Grade IV) acne: In addition to moderate grade III treatment, oral medication should be strengthened, and the course of treatment is generally 8 ~ 12 weeks, and then the medication should be reduced for 6 months. It can be seen from the above treatment scheme that in order to prevent the recurrence of acne, the treatment of acne patients should be based on persistence, and generally the treatment should be maintained for 4 ~ 6 months after the skin lesions subside, so as to have satisfactory curative effect.