It could be true, but no pics at all? An aftermarket charger.. maybe, but again I would have posted pics of the phone and blisters. Blisters are technically 1st degree burn at least (the 1st layer of skin being damaged, causing blister and the 2nd layer being ok, or it can be damage then it being a 2nd degree)? It's been a while since I took a safety to remember this stuff, but to form a blister, it had to be pretty hot. Also you're using TapTalk, so you still have the iPhone? Something that hot I don't think it would be working correctly still.
Blisters also take 3-5 days to heal, this thread was started yesterday and it's already fading? Hmmmmm
Blisters also take 3-5 days to heal, this thread was started yesterday and it's already fading? Hmmmmm