Corn paste can be used for external use, as well as 10% salicylic acid glacial acetic acid, 30% salicylic acid collodion and crystal paste. External corrosive agents must protect the surrounding skin. Cut a small hole in the center of the zinc oxide tape, the size of which is the same as that of the skin lesion, and stick it on the skin lesion to expose it. Then, the thin strips of adhesive tape are twisted into a rope shape to enclose the hole into a dike shape, and then a large piece of adhesive tape is covered with medicine, and the dressing is changed for 3 to 7 days 1 time until it falls off.

2. Physical therapy

Electrocautery, carbon dioxide laser cautery, contact X-ray irradiation.

3. Surgical resection.