You searched for: “formications
formication (s) (noun), formications (pl)
1. An itching sensation like the crawling of ants over the skin: "For some people, formications can result from excessive scratching of itching skin which may lead to misleading medical diagnoses of skin diseases."
2. A form of paresthesia producing an itching and tingling sensation like that of ants running over the skin: "The feeling of formication is one of the more common side effects of cocaine withdrawal."

"Formication is also an abnormal sensation or hallucination that ants are crawling in or on the skin; which is a common symptom in diseases of the spinal cord and the peripheral nerves."