Could be cellulitis, or shingles burns too.
Does Lupus Or Fibromyalgia Cause Blisters On Skin?I Woke Up This Morning With A Burning Blister On My Buttock And One Of My Legs. I Rubbed Them And The Skin Came Off And It Feels Like I've Been Burned By Scalding Water.my Skin Is Fire Red .
Dyshidrotic (or pompholyx) eczema causes blisters similar to the ones you describe, There is an auto-immune disease called pemphigoid which also produces large blisters.
I have blisters on my lower leg and it been three months now it does not clear up I waxed my leg and may be it came from that it is very red with blisters