Post-acne depressed scars can be treated: 1, fractional laser, etc.: suitable for medium to deeper acne marks and hollows, can be based on the depth of the skin hollows to do 1-3 layers, usually once can have a good effect, and the effect is more long-lasting, with the maintenance of the postoperative period can be achieved a more ideal result. The skin may be red and black for a period of time after the operation, and will recover in 1-6 months. 2.Surgical mechanical grinding: similar to fractional laser. 3.Surgical excision: it can eliminate very deep acne scars with ideal effect. 4.Filler method: implantation (collagen or other ingredients) injections make the depressed acne scars partially augmented so as to be flush with the surrounding skin tissues. 5.Strong pulse light, laser, radio frequency, etc.: Stimulate the proliferation of fibroblasts, so that the dermis layer thickening, smoothing acne marks hollows, and because the pulse light can stimulate the proliferation of collagen, so this method for the red acne marks and the newly generated shallow hollows are effective. 6, deep skin regeneration treatment: for deep acne, pore removal, can lighten acne marks, brighten the skin. 7, fruit acid peeling: the use of high concentrations of fruit acids for skin exfoliation, prompting the aging stratum corneum off, accelerate keratinocytes and a small portion of the upper layer of the epidermal cells of the renewal rate, and promote elastic fibers in the dermis proliferation, the shallow acne marks and hyperpigmentation have a better efficacy, but also improve the pore size, the treatment of acne, but need to go through a number of courses of treatment in order to eliminate new shallow acne scars, the advantage of safety, no side effects, the skin will become more than the skin, brighten the skin. No side effects, the skin will become more delicate than the original white.