Based on the selective photothermal theory, laser can effectively penetrate the epidermis, reach the pigment group in the dermis, crush melanin and exclude it from the body without damaging normal epidermal cells and other tissues in the dermis. So as to achieve the purpose of treating nevus of OTA without leaving scars. Dr. Changsha Face is a former public third-class and second-class hospital. Later, Changsha facial plastic surgeon was established in conjunction with the Hong Kong Institute of Facial Plastic Surgery. If the landlord wants to remove Ota's mole, he can go to the hospital for examination and consultation.