The causes of acne are multifaceted and include: excessive sebum secretion, abnormal keratinization of the hair follicle opening, overgrowth of Propionibacterium acnes, and inflammatory reactions. The development and secretion of sebaceous glands are governed by androgens. When androgens increase during puberty, sebum secretion increases, which is the root cause of acne during puberty. 2. Androgens can also cause the epithelium of the sebaceous glands of the hair follicles to keratinize and narrow the channels for sebum excretion, so that excess sebum cannot be excreted and accumulates in the hair follicles. 3. The normal flora in the sebaceous glands is dysregulated, and Propionibacterium henselae can proliferate and produce enzymes that break down sebum. 4. The free fatty acids produced after the breakdown of sebum stimulate and damage the surrounding tissues, causing inflammatory reactions mainly in the sebaceous glands and the mouth of the hair follicles. In addition, there are many other triggering factors: such as personal hygiene, skin type, living habits and general condition. Treatment principles: exfoliation, dissolution of keratin, sterilization and anti-inflammatory, drugs please go to the hospital under the guidance of a doctor, and please pay attention to daily care. 1, pay attention to warm water washing face, remove skin surface oil and dander and bacteria mixture. 2.Do not use your hands to squeeze, scratch and other stimuli. 3.Avoid the use of cosmetics containing too much oil and powder and glucocorticoid preparations. 4, eat less stimulating food, eat more fresh vegetables, fruits and vitamin-rich food, control fat and sugar diet. 5.Regulate work and rest, relieve stress, avoid excessive tension and fatigue. 6, pay attention to moisturizing, sun protection.