formication
Pronunciation: for-mi-KAY-shun
Tactile hallucination of insects crawling on or under the skin.
Full Definition
A specific type of tactile hallucination characterized by the false sensation of small insects, such as ants or bugs, crawling on or underneath the skin. Formication is commonly associated with substance use disorders, particularly stimulant intoxication or withdrawal (cocaine, methamphetamine), alcohol withdrawal (delirium tremens), and certain psychiatric conditions including schizophrenia and delusional parasitosis. Patients often engage in repetitive scratching or picking behaviors that can result in secondary skin lesions and infections. The term derives from the Latin 'formica,' meaning ant.
Usage
Usage note: Commonly misspelled as 'fornication'; pronunciation and clinical context help distinguish these terms.
In Context
- "The patient reported severe formication during methamphetamine withdrawal, leading to extensive excoriation marks." — Substance abuse assessment
- "Formication resolved completely within 72 hours of alcohol detoxification." — Progress note