--a neuropathy of the ulnar nerve, or one of the branches that lead to it; there is also the possibility of thoracic outlet syndrome (though you'd probably have more symptoms with that--do you have any others, neurological or non-neurological?).

We have boards for both TOS and neuropathy here at Neurotalk; feel free to drop in on either/both and talk about what you've been experiencing, what tests you've had, treatments you've tried or would like to . . .