At present, most hospitals and plastic surgery clinics mainly use the following methods to treat scars: 1. Skin graft site feels dull and dull, and its color is dim (2- 10 years). If the donor site is thigh or scalp, hair will grow, then the skin graft site is a scar, and the donor site will add new scars. Patients have a long recovery period, great psychological pressure and high expenses. This method is mostly used for burn and scald scars. 2。 Skin expanders can cover scars, so it is necessary to implant several expanders in the body. Most patients will have local complications, such as swelling, pain and nausea. Adjacent organs are also prone to compression and deformation, and patients have to endure great pain, and there may be problems such as hematoma, skin blood supply disorder, and dilator leakage. In addition, good skin is more likely to be damaged by thinning after expansion, and the patient is more painful, and the surgical treatment takes a long time and the cost is relatively high, which may cause postoperative scars. This method is mainly used for burn and scald scars. 3。 Surgical operations such as excision and suture: If the butt joint of the excision site is not handled properly, it will be uneven, and this method may make the face asymmetrical, resulting in postoperative scars. This operation can only be used for small scars. 4。 The popular understanding of grinding is to grind people's face or skin with medical electric grinding wheel, and the most important thing is the person who operates the machine. Therefore, higher requirements are put forward for the operator. For example, improper operation may cause secondary injury, that is, skin defects will appear when it is polished heavily, but it will not work if it is polished lightly. Because of the patient's physical relationship, new wounds often cause secondary raised scars. This method is mainly used for hypertrophic scars and pockmarks. 5。 Methods such as dexamethasone injection mainly use hormone injection, which is generally used in smaller hospitals. Patients are prone to relapse and need long-term regular use. The advantage of this method is quick effect, but long-term use of hormones may cause harm to the body, and even lead to infertility and osteoporosis. This method is mainly used for keloids and raised scars. 6。 Radiotherapy mainly uses X-ray irradiation and isotope application to treat severe patients, which is characterized by quick curative effect, but has the disadvantages of great damage to the body and incomplete treatment, which may cause tissue defect and pigment loss. It mainly treats inflammatory hyperplasia and keloid. 7。 Because it is difficult to control the intensity and depth of freezing, this method has a quick curative effect, but its disadvantages are harmful to the body, easy to cause tissue defect, pigment loss and uneven skin. Mainly used for keloid, inflammatory hyperplasia and hemangioma. 8。 Chemical methods are very corrosive to the skin and may cause uneven skin. Tissue defect, pigmentation and depigmentation will occur after treatment. This method can be used for scars above the skin. At present, there are not many lasers that can be used to treat scars. Because the thickness of laser scar removal is limited, it often needs multiple treatments, which is expensive and often leads to pigmentation. Because of the appearance of new wounds, it may lead to secondary hyperplasia. This method is not suitable for treating any flat pigmented scar. It is suitable for scars without obvious dysfunction, such as smallpox, chickenpox, acne, etc., and can also be used to treat mild hyperplastic scars.