Most of the bumps on the anus are caused by hemorrhoids. The main hazards are: 1. The bumps will affect the usual life when they grow up, and will be compressed after sitting or standing thus appearing painful with foreign body sensation. The actual hemorrhoids are usually a lot more than just the hemorrhoids. 2. Most of these hemorrhoids are mixed hemorrhoids, and if the hemorrhoids grow large, they may cause anal fissure bleeding. The large hemorrhoids can block the anal canal leading to normal stool not being able to be discharged, causing obstruction and flatulence in the intestinal tract and accumulation of food in the gastrointestinal tract. 3. If the hemorrhoids bleed and rupture frequently, it can lead to bacterial infection through the anal intestinal tract, causing systemic fever and possibly rupture necrosis of the anal canal and other symptoms.