1, acne is commonly known as “acne”, mainly in adolescents, with the change in diet and lifestyle, the incidence of adult acne is increasing, manifested as late onset acne, also known as “post-pubertal acne”, the disease age can continue until after 25 years old. In some women, it can still occur after the age of 40. 2. The causes of acne are complex, and multiple factors are involved in its development. The main factors are excessive sebum secretion, abnormal keratinization of the hair follicle sebaceous glands, overproliferation of Propionibacterium acnes and inflammation, resulting in a series of clinical manifestations ranging from inflammatory papules to cystic damage. 3. The reason for the high incidence only after puberty is related to androgens: androgens make the sebaceous glands increase in size while also increasing sebum secretion, thus triggering or aggravating it. In addition, endogenous hyperandrogenemia in women (most commonly polycystic ovary syndrome) and birth control pills (lack of anti-androgenic estrogens) can also trigger acne. Of course, the reason why acne can still occur despite normal blood androgen levels may be related to the increased conversion of androgens in the sebaceous glands and the increased sensitivity of the sebaceous glands to androgens. 4. Reasons for the aggravation of acne in some women before menstruation: Changes in hormone levels in the body during the premenstrual period lead to a reduction in the caliber of the sebaceous ducts of the hair follicles, resulting in an accumulation of sebum in the sebaceous glands, thus causing an aggravation of the rash. 5.Acne can be reduced and recurrence reduced through proper care, so acne care and treatment have an equally important role. ①You can gently cleanse your skin with a facial cleanser. If there is a lot of acne, you can soak the area with warm water more often to soften the plugs and facilitate the fading of acne. ② Avoid using pore-clogging foundations, cover-up creams or BB creams, and you can use refreshing moisturizers to reduce water loss. ③ Avoid scratching or squeezing the lesions: In principle, only acne can be squeezed out with a special acne squeezer to squeeze out the contents of the plugs, while inflammatory lesions cannot, as this will cause the spread of inflammation and increase the The risk of scar formation; ④ Attention in life: Avoid spicy and stimulating and sweet foods, avoid drinking and smoking and staying up late, and keep your bowels open. 6, acne treatment principles: the main is to remove lipids, dissolve keratin, sterilization, anti-inflammatory and adjust hormone levels. Graded treatment is used according to the performance and severity of the rash, including topical, internal, western, traditional Chinese medicine and physical therapy.