Numbness/tingling, can be pharmacological (epi, for example) or the result of neural impingement, or vascular impingement causing neural ischemia (sorry bro's, if you don't know the words look them up, I type slow).
Conditions I've noticed in enhanced BBs include thoracic outlet syndrome (when the neurovascular bundle gets sqeezed as it runs towards the arm), brachial plexopathy (classic example is a football "stinger", nerve pinch or stretch trauma), cervical radiculopathy (pinched nerve root), and median nerve impingements (carpal tunnel or further up the nerve).
A neurologist or physical therapist could diagnose these problems, my personal choice is the PT since they can't consider surgery. If it continues to bother you, get referral to one or the other.
Peace!
(A Prodigal Son)