Burning pain in hand from little finger to wrist

I had a horrific episode of tenosynovitis in my left wrist for the first half of December which finally was relieved after several weeks.  The orthopedic doctor still has me using a splint for some of the time, but the worst is definitely behind me.  I don't mind needing an occasional splint, but do look forward to tossing this thing at some point.  What concerns me is the burning pain that runs from my little finger down to the wrist.  It is not my joint and I am not aware of a tendon alongside my hand.  this is not continuous, but rather episodic.  Also, wearing the splint seems to keep this from occurring.  (I am trying to wean myself off this splint so yes I do remove it periodically.)  I don't see the ortho for another 3 weeks at which time I hope to be 100% improved. 

What is causing this burning sensation...???  thanks for any input.