Concave scar, i.e. atrophic scar, is caused by various factors such as dermis and other tissues damage, and can be improved in appearance by laser therapy, chemical peeling surgery and other ways. 1. Laser therapy: according to one’s own needs, one can choose lasers with stripping effect, such as erbium laser and carbon dioxide laser, to strip off the local irregular epidermis in appropriate amount, which can promote collagen remodeling and skin tightening, and improve the appearance of the scar. If combined with localized scarring erythema, pulse dye laser can be added. 2. Chemical peeling: chemical solution can be used to promote epidermal and dermal exfoliation and remodeling. According to the different depths of the scar, superficial, middle and deep chemical peeling can be chosen, commonly used such as salicylic acid and fruit acid. 3. Surgery: For the above treatment effect is not good and the scar affects the appearance of the case, you can also consider surgical excision after the reduction of plastic surgery suture. However, surgery is an invasive operation, which may lead to the formation of obvious scar again. The above treatment should be carried out under the guidance of specialists, such as concave scars need to be treated, it is recommended that regular hospitals.