The picture Mark posted is identified on a couple other websites as a probable case of "Cutenaeous Anthrax".(???) But like you said Kerry, it isn't a whole lot worse looking than a fiddleback spider bite.

I googled for "brown recluse spider bite" and found the images Mark posted and several more images if anyone is interested:
http://images.google.com/images?q=brown+recluse+spider+bite&svnum=10&hl=en&lr=&safe=off&start=0&sa=N

Cheers
Bill