About a week ago I noticed about 4-5 bites on my wrist and arm and I assumed they were mosquito bites , I don't remember getting them at a specific moment , they just appeared, about 2 days ago one of the bites bubbled up as if it was a burn blister , it eventually popped and now it looks horrible and another bite is doing the same thing. I'm very worried and I have no idea what happened or what it's from.