Laser removal of nevus of OTA acts on melanocytes through relatively selective photothermal action. This kind of laser can "recognize" normal skin, so the new method of laser removal of nevus of OTA can penetrate the normal skin on the lesion very smoothly and reach the lesion directly. The pigment particles in the lesion site are broken and destroyed by powerful laser irradiation, and these broken pigments are swallowed up and eliminated by phagocytes in the body. Laser removal of nevus of OTA is painless, completely tolerable, can be eradicated and does not recur.