Lasers are effective in removing acne scars, which are spots or scarring that form on this primary site after the acne has disappeared and usually persist for a long time. When it affects the normal life of the patient, the scar can be treated by laser. Common treatment methods are as follows: 1. Fractional laser: This method is a more delicate laser means, the principle of which is to penetrate the skin by emitting tiny laser beams arranged in fractions, forming peeling and thermal coagulation zones, and splitting the tissue through the formed trauma zone; 2. Intense pulsed light: This is a non-ablative non-invasive skin treatment technique, the thermal stimulation effect of intense pulsed light can activate the normal tissue repair process and collagen regeneration to improve post-acne depressed scarring; 3. Pulsed dye laser: This method is more suitable for red hyperplastic scarring. The principle is to produce selective photothermolysis of the dilated microvessels within the scar, promoting the atrophy of capillaries and facilitating the rapid receding of inflammation. However, laser treatment has certain potential hazards and adverse reactions, such as improper operation may result in wound oozing and bleeding. The improper operation may also cause excessive local heat, which may cause facial burns. After laser acne removal, the facial skin will have wounds that are invisible to the naked eye, and there is a risk of infection due to improper care. Therefore, after laser treatment patients need to pay attention to ensure that the local skin is clean and dry, do not touch, scratch or stimulate the skin with your hands to avoid the formation of new scars. At the same time, pay attention to a light diet and avoid spicy, oily and greasy food to stimulate the skin. Such food can increase the secretion of oil in the skin, which is not conducive to the recovery of trauma.