I'm allergic to sulfa medication but penicillin is ok, however my twin brother is the exact opposite. I'm also allergic to tea tree oil (not sure if spelled right). It gives me hives. My younger brother says he's allergic to the following: me, clowns, the color mauve, plastic tweezers, smilies, mountain tops with green snow on them, Microsoft, concrete pillars, squirrel-gopher hybrids, Ford cars and trucks, dragons, pegacorns and penicillin. :^o we're the same :o although i havent had the pleasure being stung yet I thought i was unique with mosquito alergies lol. The bad thing is you sort of have to scratch them. They control you. My youngest sister has this allergy too. Edit: do to the smilies in this post and the ford dealership across the street from my apartment my brother has suffered an allergic reaction that can be scene below.