Common skin malignant tumors include malignant melanoma, basal cell carcinoma and squamous cell carcinoma. Because delayed diagnosis and treatment of malignant tumors will lead to death, it is necessary to diagnose and treat them as soon as possible. Yan Yingjun, a plastic surgeon in the hospital, is not one of them. 1. Malignant melanoma is extremely malignant, and lymph and blood metastasis often occur in the early stage. Locally, it is characterized by gradually increasing massive or hard nodular lesions. After extensive metastasis, black urine or skin may appear. The principle of surgical treatment of malignant melanoma is early extensive and thorough local resection, and simultaneous or late lymph node dissection is decided according to the depth of infiltration and the presence or absence of adjacent lymph node metastasis. The best resection range of local lesions is 1.5-3 cm away from the tumor periphery, and it is wider in the direction of local lymphatic drainage, and the resection depth should include deep fascia. Wounds that cannot be directly sutured after excision should be closed by skin grafting. 2. Basal cell carcinoma and squamous cell carcinoma Basal cell carcinoma is a low-grade malignancy, which occurs mostly in middle-aged and elderly people. Head and neck, face and back of hand are the most common parts. The clinical manifestations are different: some are papular and some are nodular; Some are brown and black, and some have no color change; Some are ulcers with rolled edges, and some are hardened as sunken scars. Squamous cell carcinoma is more common in middle-aged and elderly people, and its malignancy is higher than that of basal cell carcinoma, and lymph node metastasis may occur. The head and neck are the most common parts, as are the upper limbs and the back of the hand. It was pink papulosis in the early stage, and then it gradually expanded into nodules with sclerosing areas around it. After the ulcer is formed, it smells fishy, the base is dark yellow and white, and it often scabs with horniness or pulp. There are two methods to treat basal cell carcinoma and squamous cell carcinoma: surgery and non-surgery. Surgical treatment is the most common method, and radical resection is the basic principle. The rear intersection range is generally 0.5- 1cm from the edge. After excision, the wound can be repaired by direct suture, full-thickness or medium-thickness skin graft, local, temporary or distal skin flap transfer and so on. Non-surgical treatment includes: ① radiotherapy; 2. Chemotherapy; (3) electrocautery; (4) Chemical drug decomposition method.

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