mark on my back?

[QueBert]

I doubt it's anything, but I'm not really sure and I don't have insurance. So maybe someone here can take a gander? Not sure how long it's been there, someone pointed it out to me yesterday, I checked today and it looks the same.

http://dl.dropbox.com/u/69136394/back.jpg

 

[VulgarDisplay]

Ringworm?