Acne vulgaris is a chronic inflammatory disease of the sebaceous glands that is cosmetically disfiguring and can develop in all age groups, with a high incidence in adolescents. It is mainly associated with androgens, increased secretion of sebaceous glands, hyperkeratosis of the hair follicle sebaceous openings, and Propionibacterium acnes infection. Acne has a chronic course, sometimes mild and sometimes severe, and can leave pigmentation, hypertrophic or atrophic scarring, especially the formation of depressed scarring, which is a difficult problem for acne patients. Our department has given rise to the fractional laser, which specifically targets acne scarring and offers hope to acne patients. The mechanism of fractional laser treatment is as follows: 1. When treated with pixel co2, the laser penetrates the skin to form one thermal channel; 2. The surrounding normal skin acts as an aid to speed up the recovery of the heated area. This process will repair the scar and give you a beautiful face.