It might be a type of mosquito that you've never encountered. The body will build antibodies and form a ring around the bite. The ring should go away in about 2 days or so.
Good questions. My three year old seems to be allergic to mosquito bites they get all blistered up after a day or two. I noticed that a couple of her bites have a red ring around them. Looking like a bulls-eye. Everything I have read on line says its a deer tick bite. But I think thats almost impossible for her to have come in contact with a deer tick. Can anyone contribute to this topic?