I've been finger picking for 3 or 4 months now, and learning to slap for 2 months maybe. And my thumb, index and middle finger constantly get chewed up. Today they started bleeding. And this isn't the first time. this happens maybe every 2 or 3 weeks, callous (spelled it wrong...) builds up, and than the skin just peels and my fingers either hurt to much to finger pick or bleed. My thumb from slapping is the same thing.