The formation of scar is closely related to suture technology. There are many reasons for scar formation, such as personal physique, race, injured site, treatment opportunity, treatment method, suture technology and so on. Among them, the timing of treatment, treatment methods and suture techniques are all medical reasons, and proper methods will greatly reduce scar formation. Suture technology: First of all, the suture must be strictly sterile, thoroughly stop bleeding and debridement, leaving no dead ends, and the tissues of the same layer should be sutured to each other. When the tension of the knife edge is high, the superficial fascia is sutured layer by layer with silk thread to reduce the tension layer by layer, and finally the epidermis is completely tension-free. It mainly includes suture methods, suture materials, suture tightness and many other factors, all of which are related to the formation of scars.

(1) suture method: according to different situations, different suture methods are used to close the wound, such as intermittent suture, mattress suture, intradermal intermittent suture, tension-reducing suture, etc. To get the best healing and the smallest scar. Among them, intermittent suture can make the skin wound edge close neatly, and the height and thickness of tissues on both sides of the wound edge tend to be consistent after adjustment, which is beneficial to stitches removal in several times. The advantage of continuous suture is time-saving, but the disadvantage is that it must be removed in the center; Mattress suture can increase the amount of tissue contacted by the wound edge and reduce the tension to some extent, so it is beneficial to wound healing. In order to avoid pinhole marks on the skin surface, it is feasible to sew the wound edge in the dermis, so that the epidermis will seal itself. This method is called intradermal suture, and the surface can be reinforced with external stickers.

(2) Sewing materials: Sewing materials are absorbent and non-absorbent. At present, most absorbable sutures are catgut, chrome catgut and synthetic materials. Their advantage is that they can be absorbed by themselves without stitches after deep suture. Among them, the suture made of synthetic fiber has good maneuverability and strength, and the tissue reaction is light. Non-absorbable suture is commonly used, such as silk thread, synthetic polymer nylon thread, polyester thread and so on. The latter two sutures are better. Although they do not absorb, they cause slight reactions in tissues and are widely used at present. The thickness of suture should be selected according to the tension and position of wound. Usually, the suture wound caused by small needle and thin thread is small, and the scar reaction is of course small. At present, some scholars use biological and synthetic adhesive materials instead of suture, which has certain effect on preventing scar hyperplasia.

(3) Tightness of suture: The skin suture should be moderately tight, so that the wound edges are completely contacted and neatly closed. Too tight, it hinders the blood supply at the edge of the wound, which is not conducive to healing and aggravates scar hyperplasia. Insufficient strength, or loose knots, make the wound edges unable to contact completely and arrange neatly, which also affects healing and aggravates scar hyperplasia.