Suggest Treatment For Redness And Itching Blister On Inner Leg

Rash and blisters I am 24 years old. I am 5 6 and weigh 118 I am a female. I have a small patch of little blisters that are on my inner left leg. The area is red and itches. If I touch it or is touched with anything it burns. the blisters are filled with clear fluids no puss. I have tried many different medications from the stores and it has not helped. it will stay for a little over a month than go away for months than come back. each time it goes away it will come back bigger than it was before. I have been having this problem for about 2 - 2 1/2 years now. my doctor told me it was HIV I got tested and do not have HIV. My doctor than told me he didn t know and to go get rash cream. could you tell me what it could be? my boyfriend doesn t have it and we ve been together for 2 years now.