Both of my pinkies are causing me problems. On my left hand its all straight and I cant really change notes that fast in the high register and it sounds sloppy and uneven. ON my right hand, it gets all straight and then causes my ring finger to get straight and then it causes some pain and also makes my fingers a little slower, I need fast fingers for Liebbermann's seconed movement of his sonata op. 23

find some good technique exercises, such as playing a D to Eb over and over, SLOWLY! the repetition can help it to relax, make sure you have no tension in the wrists and shoulders...