Most conscious of it in the finger next to the little finger and the middle finger. I do use a mouse in the right hand at the office only. 1 day a week max.

Also - and I should have mentioned this but I didn't think of it til just now (DUH) and it may not be related: I get a cracking in my elbow like something is loose in there. Most obviously when I do push ups (so I've stopped that nonsense). I have never "injured" my elbow. But it will crack VERY occasionally when straightened or bent. The left one does not do that.