The electrode removes the epidermis of the nevus and removes the diseased tissue by gasification in layers from the outside to the inside. During the operation, we observe the size and depth of the lesion, and remove the pigmented tissue to avoid blindly destroying the normal tissue cells, the range and depth of the pigmentation is usually identified by the naked eye. The pigmented lesions are removed until the local tissue becomes pink and normal. The wound is then modified to form a slope or disk. The wound is kept clean and dry for 1 to 3 days after the procedure. After scabbing, 75% alcohol swabs can be used to smear the wound, 1～2 times/d, generally 7～12 days, the scabs will fall off naturally. The temporary pigmentation period of some nevi lasts from 1 to 18 months, but not more than 24 months at most. Due to the combination of many kinds of vitamins that inhibit the metabolism of pigment, such as vitamin C, the pigmentation period of most cases usually disappears in about 3~5 months, and the pigmentation period of men and the elderly is relatively shorter, and some of them can be shortened to 1 month. After the pigmentation period, normal skin can be restored. High-frequency dermatoplasty instrument is the use of ultra-high-frequency electric current to produce ultra-high heat vaporization, direct and immediate removal of skin lesions. Because of the clean field of operation, the lesion of the wound is more intuitive, the lesion tissue is easy to distinguish, with no scarring of the skin after the operation, not easy to be infected, fast healing of the skin, small damage to the wound, not easy to recurring characteristics. This point is obviously better than carbon dioxide laser, freezing, high-frequency and other pigmented nevus treatment methods. According to statistics. Carbon dioxide laser, liquid nitrogen freezing and other physical therapies have high recurrence rate after healing, especially liquid nitrogen freezing method has the highest recurrence rate (87.3%). Though the treatment of circular drilling excision and shuttle excision is not easy to recur and the effect is relatively satisfactory, but there is scarring after the operation, which affects the cosmetic effect. Chemical peeling is difficult for the operator to grasp the depth correctly, leaving a pit scar or pigment loss after the operation. Precautions: 1, there is a tendency of keloid or patients with lesions invading the deep dermis, the postoperative period can be appropriate with the appropriate amount of softener for prevention and gauze pressure bandage. 2, the postoperative scab surface should be dry and clean, do not get wet, to prevent postoperative infection. 3.Protect the scab surface and let it fall off naturally. After shedding, appropriate amount of sunscreen and depigmentation drugs should be given, and cooperate with whitening mask treatment, which is conducive to pigment fading. 4.Depigmentation drugs can be used to inhibit the metabolism of pigment cells internal or external use of drugs, external use of drugs, external use of drugs can be made into creams, powders and water. Eat more fruits and vitamin-rich foods during the pigmentation period, the effect is better.