Was researching something else and stumbled upon this article from a few years ago about a condition called erythromelalgia and neurologic abnormalities associated with it. Thought someone here might find it interesting:
http://archderm.ama-assn.org/cgi/con...ll/139/10/1337
So many mysterious sources of neuropathy, so little time.

This appears to be a source of the small-fiber variety.
fanfaire