The main causes of anal pimples are as follows: 1. The impact of hemorrhoids, which are very common, is called thrombosed external hemorrhoids, and the pimples can be touched locally, and there is obvious pain. 2. The impact of polyps around the anus, or other skin redundancies, is mainly related to the abnormal friction of the local skin, and can be handled It is very simple and can be operated directly at the hospital. 3, due to the impact of local subcutaneous occupancy, mainly including lipomas, sebaceous cysts, hemangiomas, patients can go to the hospital for ultrasound examination. 4, relatively rare, may be due to the impact of sexually transmitted diseases, viral infection in the local, mainly manifested as the appearance of such small bumps at the junction of skin and mucous membrane, patients often have a history of impure sexual behavior. The most common disease is condyloma acuminata.