Hey Dr. Ryan! As I said, it is intermittent, and so far has not been predictable or regular in timing. It is only in the little finger of the left hand. Occasionally it also seems to affect that edge of the palm (below the little finger), but to a much lesser degree. I have not changed my workouts or other activities, other than mixing up programs like I usually do. It does go away on its own, without me doing anything.
As far as posture, you know how you sit with your elbow on the desk and your hand in the air (and maybe leaning your head into your fist)? It may be, and I cannot yet verify this, that this position aggravates it.
DB, I don't wear any rings.
Thanks for the replies!