Ugh, I *hate* mosquitos. Even with mosquite repellant I'll still end up with bites, and often in the most inconvenient places - forehead, back of knees, tops of toes, etc. Indysteel, mine often swell up too. Not all of them, just some, and they sometimes develop red swollen halos up to 3-4 inches in diameter around the bite. I'm not sure why that happens - if it's just an allergic reaction, why don't all of them do that? It always freaks me out. Doesn't seem to leave any lasting ill effects though.