There are orthopods that specialize in hands. I had to see one for a finger issue some years ago. He's a board certified ortho, but his specialty was hands. Not sure that ortho is the right field for this (though it certainly would be a start), but I can tell you that there are ones that are hand specialists. Not sure about a neuro that might specialize in hands though, and given your description, I'd possibly want to start with a neuro. That also is a personal bias since I've been dealing with some parasthesias with my leg and the ortho was worthless, but the neuro seems to really be trying to find out what is amiss.