I think you have parasites. Any crawling sensation on/under the skin like things moving around is parasites. It could also be mites.

This is like me i was diagnosed with peripheral neuropathy and allover abnormal sensations like freezing feeling of electricity going through my limbs, feeling crawling, tingling, numbness and what not and it turns out i DON'T have peripheral neuropathy but rather a chronic hidden infection of strongyloidiasis.