Scarring can occur from any injury to human skin involving the dermis, and causes include trauma, burns, skin infections, surgical procedures, etc. Scar formation is a slow process and often goes unnoticed until the scar appears, affecting aesthetics and function, and itching and pain, then the best time is lost. The principles of scar prevention and treatment are to enhance prevention, early and long-term treatment. For surgical incisions, attention should be paid to suturing techniques, incision direction following the skin line, minimizing wound tension, as well as early removal of sutures. For burn wounds, timely and adequate cold therapy, proper treatment of the wound, infection control, and early healing of the wound, and if necessary, early skin grafting. Scarring is not heavy in the early stage of wound healing, but pay attention to systematic scar prevention and treatment. Specific measures include: 1, medication: silicone, allantoin moisturizing class, cumene cream, vitamin C/E and other preparations, anti-itch drugs, anti-swelling drugs, hormone drugs, etc. 2.Elastic compression: use as early as possible after complete healing of the wound, applicable to all stages of scarring; maintain a pressure of 20-30mmHg; time over 23 hours per day for more than 6 months; long-term use in children can cause delayed bone development, please follow medical advice. 3.Chemotherapy uses long-acting steroid preparations, injected directly into the scar, to inhibit the excess collagen in the scar and achieve the effect of degenerating the scar. 4.Radiotherapy early (within 24 hours) after excision of keloid scars using electron beam or X-ray irradiation can reduce postoperative recurrence of keloid scars and increase the healing rate. 5.Laser treatment is suitable for scattered depressed keloid scars left after healing of burns, smallpox, chicken pox and acne. 6.Surgery: scar excision free skin graft, scar excision reduction fine suture, scar excision flap transfer, scar release local reshaping, expander implantation, microdermabrasion + recell technique, keloid core removal, etc.