Whether a depressed scar of more than twenty years can be gotten rid of is related to the patient’s physique. In case of keloid, it is impossible to get rid of it, and it is not recommended to get rid of it. Treatment by local injection, surgical excision or radiation therapy is not only ineffective, but will lead to scar proliferation. Therefore, it is recommended that such people should pay attention to protection and avoid injury on a daily basis. As for non-scarred people, depressed keloid scars can be improved, but not necessarily completely removed, and a suitable treatment plan should be chosen according to the condition of the scar. Depressed scar is mostly caused by trauma healing of skin, subcutaneous tissue or deep tissue defects. If the area of depressed scar is small and shallow, it can be treated by local scar tissue cushioning method, in which the deep tissue cushions the depressed area, so that the depression disappears and the skin basically returns to normal state. If the area of depressed scar is small but deep, it is necessary to transplant dermis, fat, fascia, cartilage or even bone tissue to the depressed area, and then suture together after excision of the wound, which can restore the skin depression, but not completely restore to normal skin condition. If the depressed scar area is larger and deeper, flap surgery is needed after excision of the scar, and later, deep tissue, such as tendons, nerves, bones and other defects have to be repaired to restore the function and shape of the depressed scar area, which can only improve the size and depth of the scar and cannot be removed.