Hello Customer (name blocked for privacy),
I'd like to help you and would appreciate if you could provide a few more pieces of information.
1) Where on your back are these spots located?
2) Is the skin around the blisters red?
3) Do you have any burning, stinging, or discomfort associated with this lesions?
4) Do you have any other major medical conditions, such as diabetes, rheumatoid arthrities, etc.?
Thanks.
Dr. Tanner