The picture of the guy's hand is a brown recluse bite. Their bites cause necrosis of tissue that can keep coming back for years sometimes. I have heard of some people being treated with a stun gun or electrical shocks to stop the damage (they do the same with rattlesnake bites sometimes).
Since we are in a competition to gross one another out, here is what a good rattlesnake bite looks like:
The Camel Spider isn't a spider at all (they have 10 legs and spiders have 8) and they aren't venomous. They have big fangs and can give a painful puncture wound for a bite but other than that they are harmless. My buddy in Las Vegas has gotten something similar in his garden and they are pretty big and scary but that is about it. I was more freaked out by the Black Widow I nearly put my hand on when I was out there that was by his swimming pool.