The common causes of a lump on the anus are as follows: 1. skin redundancy, this lump does not have any painful symptoms, the whole lump protrudes from the skin and has a relatively small neck, which can usually be eradicated by surgical removal; 2. if there is a painless lump around the anus, especially if the lump increases after defecation, consider it a manifestation of hemorrhoids; due to varicose veins around the anus, the anal cushion moves down to form a hemorrhoid nucleus, which can be The soft painless lump can be touched around the anus, so usually pay attention to keep the stool open; if the lump is larger, you need to go to the hospital and have surgery if necessary; 3. Perianal abscess can also be touched in the anus as a lump, which can be accompanied by redness, swelling and pain, and the patient needs to take oral antibiotic medication in time; once an abscess is formed, surgical incision and drainage is needed. Regardless of which case a perianal lump is found, the patient needs to go to the hospital in time to get a diagnosis and then treat it symptomatically.