Various types of surgeries such as thyroid surgery, open heart surgery, abdominal surgery (appendix, liver, intestine, cesarean section, etc.) often leave unsightly scars after the injury heals. As time passes, the scars may become wider or even proliferate and become red, painful and itchy, causing endless troubles to the patients. The main reason for this phenomenon is that the skin suture of common surgery is a single layer of penetrating suture, and the incision relies solely on the newly formed scar to pull it together. Due to the change in subcutaneous tissue pressure, the incision scar is subjected to greater lateral tension, and this tension is continuous. Over time, under the continuous tension, the deep fibrous tissues of the scar will keep proliferating and the collagen will thicken , making the scar gradually widen, and if there is chronic local inflammation, i.e., it may form scars with painful and itchy symptoms. For the repair of old surgical scars, depending on the shape and proliferation status of the scars, one phase of repair or staged repair is generally available. If the scar growth is not very serious and is linear, the skin on both sides can be excised directly, and the dermis can be sutured in layers with accurate alignment, and then the epidermis can be sutured; if the scar growth is serious but the conditions for surgery are still available, the scar can be excised and sutured, and then radiotherapy can be combined with topical anti-scar medication; if the scar cannot be excised at one time, excision can be considered in stages to gradually reduce the scar area, and eventually the scar can be minimized. If the scar cannot be excised at one time, it can be considered to reduce the scar area gradually, so that the scar can be minimized.