I noticed a week ago my tortoise had injured his shell..its almost like a little chip on his side, either he has caught it or maybe the other tortoise has bit him? it bleed a little but didn't seem to be anything serious..and he seems happy. however, I has just given his a bath and noticed it is bleeding again, again its not pooring, not even trickling, but when I dried him there was a spot of blood on the towel? should I be worried? (i am worried!)