The symptoms of a bulge in the anus basically do not heal on their own and are mostly caused by perianal diseases, including hemorrhoids and perianal abscesses that can cause this phenomenon to appear. If left untreated, the symptoms may worsen, and if caused by hemorrhoids, blood clots or venous blood clots may form around the anus, mostly under the skin, so it looks like a bulge. If left untreated, it can cause pain and itching around the anus, and in severe cases, it can affect bowel movements and cause blood in the stool. If it is caused by a perianal abscess, not only will the anal bulge appear, but also swelling and pain as well as redness, which will lead to abscesses and breakage if not treated in time, thus causing anal fistula symptoms.