Anal mass swelling and pain, may be due to perianal abscess, external hemorrhoids, anal papilloma and other disease causes. 1. Perianal abscess: this disease is usually caused by the rectum and anal canal tissues and the surrounding interstitial infection, mainly in the perianal area, the deep rectal abscess is rare. Therefore, when there is a lump, swelling and pain in the anus, it may be caused by perianal abscess. 2. External hemorrhoids: the disease is usually due to the expansion of the venous plexus under the dentate line of the anus, or thrombosis and other causes, mainly manifested as a mass protruding in the perianal area, which can cause anal lumps, swelling and pain, may also be accompanied by anal itching, pain and other symptoms. 3. Anal papilloma: this disease mainly refers to the growth of papillary lesions at the level of the dentate line, usually caused by fibrous connective tissue hyperplasia, which can be manifested as a lump in the anus, pain, and may also be accompanied by anal itching, swelling and other symptoms. Anal mass swelling and pain, may also be caused by other reasons, it is recommended to consult a doctor as soon as possible, after a clear diagnosis of the cause of the disease, to give targeted treatment and conditioning.