<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, Im having some digestive problems. Ive been experiencing black, tarry stools Melena, and Ive also been itching around my anus. What could be the problem?  <response>: Based on your symptoms, it is likely that you are suffering from a rectal disorder. Further examination and tests will need to be done to determine the specific diagnosis and treatment plan. 