Years ago I saw a film on TV in which a man rips off the skin from his own arm and then puts some kind of substance/cream on it which I think may have helped it to grow back. He didn't feel any pain as he did it so it was either an artificial arm or he was conditioned in some way not to feel pain. I think (but not certain) that it might have been some kind of spy/secret agent adventure/thriller thing, but not one of the Bond films.