Anal meatus exstrophy, may be due to hemorrhoids, rectal prolapse or rectal tumors and other diseases. 1. Hemorrhoids: Hemorrhoids include internal hemorrhoids, external hemorrhoids, and mixed hemorrhoids. During defecation, the hemorrhoidal core of the internal hemorrhoids may come out from the anus due to straining, or squatting for a long period of time because of the dryness of stools, and turn over to the outside of the anus, presenting one or more ring-like prolapses. 2. Rectal prolapse: also known as prolapse in medicine, including rectal mucous membrane prolapse, total prolapse, etc., in the case of straining during bowel movement or constipation, the anus will be turned out, presenting a pink soft lump prolapse. 3. Rectal tumor: if the rectal tumor is close to the anal opening, it may protrude out of the body with exertion during bowel movement, and there will be anal ectropion, which may be accompanied by pus and blood in stool, pain and hard lump when touching. To summarize, all of the above situations will appear in the case of anal ectropion with swelling, need to go to the hospital in time to check the cause of the disease, and give targeted treatment as soon as possible to avoid delaying the condition.