pics of my dead corn... ideas?

[daddy and son]

Hi all, this is a follow up on my earlier post about the feeding problem. Fred took quite a while in eating his pinkie. The pinkie was frozen so there wasn't a fight to the finish. He took it down head first. There was what looked almost like a scab on the top of his head. No blood or anything, just a small (about 2-3 mm) rough spot. I took a few pics to post. I tried getting one as close as I could of the inside of his mouth. There was a small blood spot, like a scratch on the roof of his mouth. Any ideas would be greatly appreciated. As most of you know, I'm new to this and trying to learn as I go. I just hope I didn't do something wrong on this one.