That is definitely trigger finger! Important: You need to see a hand specialist Dr. as soon as possible! I had the same thing about 3 years ago, and one of my friends had it before that. We both wound up needing surgery, but it's minor surgery. The usual course of treatment is to get 2-3 cortisone injections into the base of the finger, about one month apart (these burn terribly). If that doesn't help, the Dr. will recommend surgery to release the tendon. It was very scary for me, I worried about being able to play. But, after a recovery period and regular pinky exercises (relaxed slurs), everything's fine now. The sooner you see the Dr., the better.