Laser is widely used in dermatology and can treat a variety of skin diseases with remarkable efficacy, which is very popular among patients. Lasers apply a specific wavelength of laser beam to destroy the target tissue without damaging the normal skin tissue, which is safe, effective and less painful, fundamentally solving the drawbacks of previous treatment methods. There are many types of lasers. When high-powered lasers act on tissues, the purpose of treatment is achieved by the tissue absorbing laser energy in a very short time and increasing the temperature to several hundred degrees, thus causing denaturation, coagulative necrosis, charring and vaporization. The low power laser has an exciting stimulating effect, improves blood circulation, increases metabolism and enzyme function, and promotes tissue proliferation. With the development of modern laser technology, laser medicine has brought more health and beauty to human beings and has made important progress in the treatment of skin pigmentation and vascular diseases. Lasers have also shown their miraculous efficacy in the treatment of facial nevi, freckles and capillary dilation. Lasers can permanently remove body hair and have a significant therapeutic effect on photoaging skin – wrinkles, skin roughness, irregular pigmentation, and enlarged pores. The laser can also remove various superficial skin swellings such as age spots, flat warts, common warts, and condyloma acuminata, and there are generally no adverse reactions or significant side effects during laser treatment, and after cure, recurrence is not easy.