Hi, I woke up yesterday with blisters behind my ears. My skin has felt overly sensitive for a couple of days now, and I'm starting to get the same kind of blisters on my face. I haven't used anything different, no new laundry detergent, shampoo, perfume, makeup, etc. Can't think of what could cause this. My face is very red as well, and my skin overall just feels tingly and itchy almost everywhere.