In reply to Andy Moles:
Have the same thing in my LH middle finger PIP joint and RH middle finger DIP joint.
Causes discomfort if knocked, pressed or sometimes pulled sideways, but doesn't really affect my climbing much. Bit stiff if fully crunched in the mornings, usually warms up over the day.
Went to see a finger specialist and was referred for an ultrasound. No pulley or ligament injuries. Referred on to a hand therapist who thought it was arthritis.
Suggested that I would have got it anyway so carry on climbing...
Dietary advice was avoid 'nightshades' as can be inflammatory, warm up joints before climbing (bathe in hot water if possible), cool down inflammation after climbing with ice or cold water baths.
I had a similar thing in my LH ring finger which caused my gyp for about 18 months then just faded away. I am assuming the same thing will happen with these fingers.
Would be interesting to refer this thread to a hand specialist...