I just got my internet back, so much happens when I'm gone for a day!

So, I hate to be that person soliciting medical advice on the interwebs, but we're without insurance right now, and I have a little bit of a worry. I'm usually pretty laid back about what ails my family, but my 2 year old has some sort of bug bite on his leg that looks kinda weird. I'm totally clueless as to what may have bitten him down here besides mosquitoes. He's had plenty of mosquito bites and doesn't react this badly to them. He's not acting any different, no fever. The spot was warm yesterday, but not today. It looks a little worse today and I have no idea what that dot pattern is.

Any information is warmly welcomed.