<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have this mass or swelling around my anus, and Im experiencing sharp abdominal pain along with dark tarry stool. What is wrong with me?  <response>: Based on your symptoms, it appears that you have hemorrhoids which are inflamed veins in your rectum or anus causing a mass or swelling around your anus and sharp abdominal pain. The presence of melena, or dark tarry stool, may also suggest internal bleeding. 