My ring finger and little finger does the same as yours does. Mine does it when I am holding a fork or holding my arm the wrong way. I do believe Jo is right on this. I think it's other nerves involved.

I took pictures of mine so I can show them to my hand surgeon when I get to see him. I am busy with other issues so it's kind of on a long list of things to have taken care of but it is getting worse. I have to massage my finger and it feels like in the palm of my hand there is a knot and it does hurt.

You might want to find a hand surgeon to check it out. You can have other things besides the TOS going on. I have had 2 rotator cuff surgeries, one ulner nerve and a triggerfinger and still have carpal, cubital, and radial nerve syndrome.

Hope you find some answers and help for all of these soon.

Ada