--Reflex Sympathetic Dystrophy, which is a neurological disorder that shares some characteristics with neuropathy, in that it does involve peripheral nerve dysfunction. In the case of RSD, there seems to be some runaway neural reaction in response to trauma that results in parasthesas and allodynia ("weird sensations" and nerve pain without stimuli to cause them, respectively), often associated with color changes and autonomic dysfunction in the affected area.

The entity is often thought to be a subset of Complex Regional Pain Syndrome (CRPS).

See:

http://neuromuscular.wustl.edu/senso...tml#idiopathic