[He can't really argue with that, and the doctor does already know that he's hollow, so...

He sighs and stretches out his left leg, removing a bandage to reveal a hole that goes almost all the way through his leg. It's still seeping blood, sort of, but not from any identifiable region as he's clearly hollow inside.]

I'm not sure what anyone can do. It's not healing up properly because metal doesn't grow, but it's not getting worse either.