Anal tumors, including benign tumors and malignant tumors. Benign tumors include fibroids, lipomas and so on. Malignant tumors include anal canal cancer and perianal cancer, and there are the following types: 1. squamous epithelial cancer, which is the most common type and accounts for 50%-75% of anal canal and perianal cancer, and is treated mainly by surgery, supplemented by radiotherapy and chemotherapy. 2. basal cell carcinoma. Malignant melanoma is a malignant lesion derived from melanocytes, and perianal malignant melanoma is very high in malignancy and early in metastasis, so the prognosis is extremely poor and the effect of various treatments is very unsatisfactory. The treatment principle is early diagnosis and early surgery.4. Perianal Paget’s disease, a rare intraepithelial adenocarcinoma, also called perianal eczema-like carcinoma, surgical excision is the main treatment method.