The reason for this is the following: 1) polyps around the anus, which may be caused by local friction and a slight increase in local skin. 2) hemorrhoids, especially thrombosed external hemorrhoids, which may be accompanied by significant local pain in addition to the bumps. 3) sexually transmitted diseases, where the patient is infected by a virus after engaging in bad sexual behavior. The actual fact is that you can find a lot of people who are not able to get a good deal on a lot of things. These subcutaneous swellings can be determined by ultrasound, and the larger, faster growing ones may require surgical treatment.