I don't know what's the story behind this. Just saw it on Reddit and I immediately thought of SVTP and Brown Recluse spidies...
http://www.reddit.com/r/pics/comments/ubjnl/it_started_out_as_a_normal_spider_bite/
http://www.reddit.com/r/pics/comments/ubjnl/it_started_out_as_a_normal_spider_bite/