The following is the information I found in Quanzhou Sunshine Pure Korean Plastic Surgery, hoping to help the landlord! The types of acne and its harm to the skin mainly include: 1, acne caused by sebaceous gland blockage in hair follicles: it can develop into inflammatory papules, pustules, nodules, cysts, powder tumors, cysts, pigmentation, large pores and even scars. 2, white-headed acne: hair follicle sebaceous glands are blocked by keratinocytes, and keratin and sebum are filled in them, not communicating with the outside world, forming a closed acne that looks like a slightly protruding white head. 3, blackhead acne: hair follicle sebaceous glands are blocked by keratin and sebum, and the opening is connected with the outside world, forming an open acne, and the surface looks like a big or small black spot. 4, papules: it is the most basic damage of acne. When the sebaceous glands of hair follicles are blocked, an anoxic environment is formed in the sebaceous glands of hair follicles. Propionibacterium anaerobic acne proliferates, decomposes sebum, produces chemokines, and white blood cells aggregate to produce inflammatory papules, so this papule belongs to inflammatory damage. 5, pustules: It is the further development and aggravation of inflammatory papules. Hair follicle sebaceous glands gather a large number of neutrophils, Propionibacterium acnes has an inflammatory reaction, and a large number of pus cells accumulate to form pustules. This situation is easy to form scars after healing, mainly concave scars. 6. Nodules: On the basis of pustules, a large number of keratin, sebum and pus cells are stored in the sebaceous glands of hair follicles, which destroys the structure of the sebaceous glands of hair follicles and forms red nodules high above the skin surface. The basement has obvious infiltration, flushing and tenderness.