That's why I said it looks like a bite. Had something similar about two weeks ago. I could see the bite marks also. Stayed red for about a week. 95 to 99% of the time if it looks like a spider bite to you it probably is.
No, it most likely isn't.
This link from the AMA puts the rate of misdiagnosis at 80%, but the study I mentioned earlier was from the department of arachnology at a state university (can't find the link):
http://www.ama-assn.org/amednews/2002/08/05/hlsa0805.htm
A lot of hype and myths revolve around the Brown Recluse, but you may want to look up the facts.
I do know that.