boobie rash

Chelsea

ive had this sort of rash around my nipple for months, ive been tested its not a disease or infection, the doctor put it down the dry skin. But its still there and its sore and itchy and feels like a blister when i wear a bra and it rubs or if i itch? could it be ezcema? because ive moisturised and used cream for dry skin and its not working lmao