One huge blister/bubble

OK i have this one kind of big bubble/blister like on my back, but the thing is i have it for a few months. I doesn't hurt or anything but it is still there after a few months.

[Bhupinder Kaur, MD]

Hello,
It can be due to Herpes Zoster(unilateral and painful), bullous staph infection, bullous pemphigoid,plant contact dermatitis or allergic reaction. For confirming the diagnosis, I suggest you to get an evaluation done from a dermatologist.

It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.