Depressed scar, i.e. depressed keloid scar, is left after the healing of dermal and deep tissue destruction caused by various reasons. Once the scar appears, it cannot be completely eliminated, and it can be improved by laser treatment, chemical peeling, surgery and other ways of treatment. 1. Laser treatment: you can choose stripping laser, including erbium laser, carbon dioxide fractional laser, etc., which can improve the appearance of scar through its stripping and promote the role of subcutaneous collagen regeneration. 2. Chemical peeling: clinically, professional concentration of fruit acid and salicylic acid can be used to peel off the local epidermis of keloid, stimulate wound repair and collagen remodeling, but it usually takes several times of treatment to see obvious results. 3. Surgery: For scarring that is ineffective in conservative treatment and affects the appearance, it can be improved by surgery. However, surgery is an invasive operation and may lead to the formation of scar again, so it should be chosen with caution. The above treatments should be carried out under the guidance of specialists, if you need treatment, we recommend regular hospitals.