Need a little help

My poor ball Checkers went missing 2 weeks ago in our home and our cat found him. I did the q-tip thing to check his mouth nothing wrong with his nasal cavity or throat. But he has a small burn on his tail. It is healing I have had him back for almost 3 days now and some has fallen off and the skin under it does not look infected. Does it look ok to you? It is the brownish black marks sorry for the poor picture. http://s861.photobucket.com/user/Jen...5.jpg.html?o=6

I really cant see the pic well. What caused the burn?

I don't know I think he got caught somewhere while he was lost where it might have been hot. I had a heat pad laid down as a trap so he might just have a burn from that....