Depressed scar refers to depressed scar, the repair needs to be based on the time of scarring to determine the specific treatment program, commonly used excision suture, filling surgery, skin abrasion, etc.. 1. Excision suture: It is suitable for those who have close adhesion between the scar and the deep tissues, or the deep tissues under the scar are defective, and the scope of the scar is small. Generally, a very thin layer of epithelial tissue on the surface of the scar can be excised, and then the incision can be sutured. 2. Filling: If the skin of the depression is still normal, the subcutaneous tissue is adherent to the deep tissue, and the deep tissue is defective, dermis, fascia and other tissues can be used to fill. If the depression is scar tissue, the scar should be excised first, and according to the local trauma, free skin flap should be used for repair. 3. Skin resurfacing: For shallower punctate indentations, the higher areas can be smoothed until they are in line with the indentation. For lesser scarring and larger scarring, collagen or fat particles can be injected to fill the depression to improve the appearance. The repair of depressed keloid scars needs to be considered according to the actual situation. Patients are advised to visit regular hospitals and choose the suitable repair method under the advice of doctors.