formication
Pronunciation: for-mi-KAY-shun
A tactile hallucination involving the sensation of insects crawling on or under the skin.
Full Definition
Formication is a specific type of tactile hallucination characterized by the false perception of insects crawling on or beneath the skin surface. The term derives from the Latin word 'formica,' meaning ant, reflecting the typical sensation described by patients. This symptom can occur in various psychiatric conditions including delusional parasitosis, substance withdrawal (particularly alcohol and stimulants), psychotic disorders, and certain medical conditions affecting the nervous system. Patients experiencing formication may engage in excessive scratching or picking behaviors, leading to secondary skin lesions and infections. The symptom requires careful assessment to distinguish between psychiatric, medical, and substance-related etiologies.
Usage
Usage note: Often misspelled as 'fornication'; watch for this common error in clinical documentation.
In Context
- "The patient reported formication during methamphetamine withdrawal, describing bugs crawling under her arms." — Substance abuse assessment
- "Dermatological consultation was requested to rule out medical causes before attributing the formication to psychiatric illness." — Consultation request