Laser blemish removal is the treatment of skin discoloration using laser light. Its principle is that it can use a specific light source to selectively act on different skin tissues, which can ensure that only the pigmentation spots will be effected without affecting the normal skin tissues. Therefore, it is an ideal method to solve the problem of pigmentation at the root, and it is safer than the traditional way to remove pigmentation. However, after the laser blemish treatment, local cold compress is needed to relieve the pain. Scabs will be produced on the treatment area, which will easily cause pigmentation and leave scars if removed artificially. Some patients with more sensitive skin may experience edema in the operated area after the procedure. Secondly, laser blemish removal generally uses strong light, which can cause quite serious damage to the retina and cornea. If the operation is not done properly, retinal damage may occur, which may lead to blindness in serious cases. Therefore, eye protection is required throughout the treatment process. In addition, laser blemish removal may also be accompanied by anti-darkening phenomenon, that is, after over-stimulating the skin, it causes inflammation reaction and produces certain pigmentation. Since melanocytes are more active in yellow people, postoperative inflammation-induced melanosis and hyperplasia are also more likely to occur.