When there is a lump at the anal opening, it may be due to hemorrhoids, perianal abscess, rectal prolapse and other diseases. 1. Hemorrhoids: usually due to poor defecation habits, sedentary standing, constipation and many other factors, resulting in substantial venous masses in the perianal skin, clinical manifestations of bleeding after defecation, anal lumps, anal itching, moist or with pain and other symptoms. 2. Perianal abscess: usually due to infection, anal gland obstruction and other factors, leading to suppurative infection of the soft tissues around the rectum and anal canal and the formation of abscesses, resulting in the phenomenon of anal opening with a lump. It can be seen that the perianal area is accompanied by swelling, pain, skin fever, and even pus flow and other manifestations. 3. Rectal prolapse: usually due to increased abdominal pressure, dysplasia and other factors that lead to rectal mucosa prolapse from the anus, appearing in the anal opening with a lump phenomenon. Often accompanied by anal swelling, itching, defecation difficulties and other symptoms. There may be other reasons such as polyps, tumors, etc. It is recommended that patients go to the hospital for timely examination and targeted treatment under the guidance of the doctor.