I have had a rash on the back lower part of my legs for 2 months now. It started out as, what looked like a mosquito bite, that itched really bad. now it has gotten larger and not only itches but has become painful. they almost look like blisters now and still itch. I went to my GP who said it was just a fungus rash and gave me an ointment, it never helped.. I've tried everything over the counter.. can you tell me what this might be