A few months ago,I started getting sharp pains right above my right ankle. When I looked down, I had a red rash all the way around my leg(in the area of the sharp pain).I went to rub my leg and there was a bubble(like the top of a straight pin). So when I touch the bubble,I want to scream. What is this?? I have already gone to my family doctor,he didnt seem to see or find anything while I was there.