<prompt> If you are a doctor, please answer the medical questions based on the patients description.I have this sore on my leg that just wont seem to heal, and the skin around it looks infected. What do you think it could be?  <response>: Based on your symptoms, it sounds like you might be suffering from a chronic ulcer. We can do some tests to confirm, but this can be caused by a variety of factors such as poor circulation, diabetes, or obesity. 