formication

noun

1. (countable, uncountable)An abnormal skin sensation similar to that of insects crawling over or within the skin; a tactile hallucination involving such a sensation. A common side-effect of substance abuse, it can also be experienced with high fever, menopause, skin cancer, diabetic neuropathy, or herpes zoster.

   “Soon the formications and muscular debility returned, not alone, but accompanied with painful cramps and startlings in the feet and calves of the legs.”