i gave my lil foot a bath n rubbed his lil head all was good put him back in his home n went to go get him some lunch when i fed him i noticed a piece of his skin was missing on his head
Oh my. I've never seen that before. As long as it's not bleeding I would think it will be ok. You can put a tiny dab of Neosporin on it. It seems like it would have taken a pretty big thump to bump it hard enough for that to come off. Poor little guy.
Of course, if you're really worried, you can always take him to the vet.