I went for a nerve con. test, the results stated the ulnar nerve is blocked and a demyelinating lesion. please explain what this means (d.lesion)

Weakness: There is an electrical change in the nerve signal- conduction- across the ulnar nerve. The ulnar nerve provides signals to your forearm and hand. You may have had symptoms of sensory tingling at the elbow radiating to your 4, 5th finger and may have had weakness with flexion with these fingers also. Demylinating means that the covering, myelin, is damaged. You must find the cause.