| ICD9 = | }} Formication's the medical term for an abnormal sensation of insects crawling on or under the skin. It refers to a specific form of a set of sensations known as paresthesia, along with the more common prickling tingling sensation of "pins and needles". The experience of formication may cause feelings of pain or trigger the scratch reflex. Some of those suffering from the sensation are at risk of causing skin damage through excessive scratching. Fixating on the sensation may in som… (More on Formication)