I've gotten hives a number of times over my life.
(1) was definitely from penicillen (sp?) when I was sick
(2) my friend's house... she has a cat so that could be it but i had kitten when i was younger and never got any hives so we still don't know why everytime i come from her house i get them.
good luck at figuring out why you got them! try real hard to examine everything your exposed to |