a little help please?

I recently purchased this male hog island from a guy on kingsnake, the snake seems to be in good health other then the fact that he has this sore on his neck just behind his head, I would really like some feedback on to what might have caused this..

Thanks.

http://i29.photobucket.com/albums/c2...l/DSCF0386.jpg

Ah! Did you buy him like that?? :O:confusd:

I noticed the sore a few days after I purchased him, the sore looks the same as it did when I first noticed it.. so I am assuming it was there before.. It is possible it came from me, but the way the sore looks I don't think it happened while in my care.. but that is why I am posting here, to see if it is something I should be worried about.

It looks like a pretty big gash from the picture, is it an open wound?

Oh my...It looks like a burn from a heat source or maybe scale rot? I would bring it to the vet. Always examine your animals when you receive them. Now it might be too late to bring it up to the seller.