Old scars are usually old scars left on the surface of the body after the patient’s trauma has healed, for which there is no specific drug treatment at the moment. If the scar does not affect normal life, or if the patient is not in a hurry to get rid of the scar, he can try oral vitamins and topical vitamin E. Long-term persistent use may have some effect on scar repair. However, for old scar, laser or surgical treatment is the treatment with better clinical effect: 1. Laser treatment: commonly includes fractional laser scar removal, pulsed laser scar removal, microcrystalline scar removal machine scar removal, etc. The principle of this kind of laser scar removal is to repair different tissues and different degrees of scar without harming skin tissues through the control of laser wavelength. Laser treatment is one of the new scar removal methods developed in recent years, with the advantage of small trauma and fast effect, but there is a certain risk that improper operation or improper post-treatment care may cause new permanent scarring; 2, surgical treatment: common such as scar excision, skin abrasion, scar excision free skin grafting, etc. This type of surgery is suitable for protruding proliferative scar, and post-operative application of drugs to prevent scar regeneration. For depressed keloid scars, skin grafting or hyaluronic acid filling is used to elevate them. The advantage of surgical scar removal is that the technique is mature and the possibility of recurrence is low, but the surgery is invasive and the recovery time is long. Alternatively, liquid nitrogen freezing and intravenous glucocorticoid injections are available for scar removal. However, patients need to be aware that most old scars cannot be completely eliminated, but with the above methods, the scar can be reduced and made less visible, and the quality of life of the patient can be minimized.