Fractional laser can improve acne pits, the depressed scarring that remains after acne has healed. Fractional laser is a laser spot that acts on the skin to form a dense sieve-like microtreatment area, with the damage confined to the microtreatment area and adjacent tissues, and promotes collagen regeneration and rearrangement through the process of localized thermal damage to the area to improve the degree of indentation of the scar. Acne pits are generally caused by the lack of localized skin fibrous protein and collagen after the healing of such infectious lesions as acne, and fractional laser can be taken to stimulate local collagen production to improve the state of acne pits. It usually takes several treatments to achieve the ideal state, and another laser treatment requires strict sun protection. It is recommended that the patient according to their own situation, to the regular hospital dermatology clinic, follow the doctor’s instructions reasonable treatment of pimples on the skin.