There are many reasons for this: First, there may be rectal polyps or rectal adenomas, which can be formed when the intestinal mucosa is stimulated by long-term diarrhea or constipation, thus forming rectal polyps or adenomas, which have no special clinical symptoms and can be palpated by rectal palpation. If the patient has had hemorrhoids in the past, a long-term diet of stimulating foods, such as chili peppers, a lot of alcohol can sometimes lead to swollen hemorrhoid nuclei, which can also manifest as varicose vein clusters visible in the anus, manifesting as soft masses are varicose hemorrhoids. If the hemorrhoid nucleus has been blocked for a long time, sometimes a blood clot is formed and the texture is hard, it may be a thrombosed hemorrhoid. A round swelling in the anus can be examined rectally and if necessary, anoscopy can be placed to clarify the cause.