Acne is a chronic inflammation of the sebaceous glands of hair follicles. Since it grows mainly on the face, it has a significant impact on the image and has a long course, making it a lingering problem for many people. The main factors in the development of acne include: 1. The development and secretion of sebaceous glands The development and secretion function of sebaceous glands is governed by androgens. In addition, factors such as a high GI index diet can increase the production of sebum. When epithelial cells shed from the follicle wall mix with sebum to form keratin plugs in the follicle opening, the secretions of the sebaceous glands do not drain well and acne is formed. 3, microbial infection Bacteria, mainly Propionibacterium acnes, cause local inflammatory reactions, resulting in papules, pustules, nodules and abscesses. Therefore, the treatment of acne mainly focuses on the above links, using chemical drugs or physical therapy to reduce sebum secretion by sebaceous glands, dissolve keratin plugs that block pores, anti-microbial infection, and reduce the inflammatory response. At the same time, patients develop good dietary and lifestyle habits that can reduce sebum secretion, improve the treatment effect and maintain the efficacy.