yesterday i had a sudden allergic reaction where my face, chest and arms were covered in itchy hives, most of which were very hot to the touch. there was no apparent trigger. i took two benedryl and the hives began to subside, but today i have pimple-like, painful red spots where several of the biggest hives were. why did my hives turn into these? it's extrememly painful and embarrassing all over my face and arms....