The symptoms of a flesh growth on top of the anus are mainly caused by perianal diseases, including hemorrhoids and perianal abscesses. First of all, the main cause of this symptom is hemorrhoids, which are caused by varicose veins around the anus, forming thrombi or venous clusters around the anus that are located under the skin, so they look like a sarcoma and cause a significant feeling of swelling and swelling as well as pain. Secondly, perianal abscess can also cause sarcoma around the anus. The symptoms of perianal abscess are mainly due to the infection of the anal glands, which spreads to the skin around the anus, forming lumps or abscesses around the anus and causing redness, swelling and pain. In addition to these causes, a prolapsed anal papilloma can also trigger this phenomenon.