<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing incontinence of stool, pain of the anus, low back cramps, and I noticed a mass or swelling around my anus. I also saw some blood in my stool, what could be wrong with me?  <response>: Based on your symptoms, it seems like you may be suffering from an Anal Fistula. 