The reasons for the painful anal growth bumps are the following: 1, prolapse, also known as rectal prolapse, the anal canal, rectal mucosa or rectum, part of the sigmoid colon downward displacement, prolapse out of the anus disease. 2, intestinal polyps, which is a common benign swelling of the rectum, will develop at the end of the rectum, when stool can be prolapsed outside the anus, retracted after the stool. 3, hemorrhoids, because the internal hemorrhoids prolapse, external hemorrhoids, etc. will be found in the anal opening flesh-like things The first thing you need to do is to get rid of the pimples. 4. rectal smooth muscle sarcoma, made by the proliferation of heterogeneous smooth muscle cells, mostly located in the lower rectum. 5. rectal malignancy, rectal malignancy of blood in the stool is often the same as hemorrhoids, polyps, etc. If there is a painful fleshy bumps at the anal opening, you must go to the hospital in time for examination to identify the cause and then treat the problem.