People sometimes complain that they have the sensation of insects crawling all over their body and itchiness as well. This is called formication.
Here is a prescription from Huh Im, a Korean doctor in the 1600s, which you might want to try if you have any patients with the complaint.
Apply 7 moxa cones at prominence the olecranon.
Apply acupuncture at LI 11, HT 7, LI 4 and SP 6.