formication
\fawr-mi-KEY-shuhn\
noun
1. a tactile hallucination involving the belief that something is crawling on the body or under the skin.
Quotes
“They say not.” “I was told he was.” “Perhaps you will allow me to know better,” said the doctor. As though to resolve the argument, a muffled voice from the stretcher said: “Itching, Eddie. Itching all over like hell.” “Formication,” said the doctor.
-- Evelyn Waugh, Officers and Gentlemen, 1955
Origin
Formication came to English in the early 1700s from the Latin formīcāre "to have a sensation that ants are crawling on one's skin."
Dictionary.com
