Lizzie, Well, that's not very neighborly of that spider! Have they no manners?
I thought this was interesting:
http://www.aafp.org/fpr/20041100/10.html
The stinging made me think of MRSA. I hope they will culture the area because it's the only way to tell for sure. There have been cases of people getting MRSA and the flesh-eating crap from just being outside and not from bugs.
I hope it gets better and they don't have to do debridement.
Annie