The last 3 days, I've been playing my ass off (much more then usual). After the first 2 days, my fingers started hurting. Not like the muscles or cramps, the fingertips. The part that actually hits the string (only on my right hand BTW, my picking hand) is really sore and raw feeling. It doesn't bother me until I actually start playing, then it hurts like hell. Any ideas? Why, after years of playing bass and having nice hard fingertips, do they all of a sudden hurt so much?