formication
Pronunciation: for-mih-KAY-shun
The sensation of insects crawling on or under the skin when no insects are present.
Full Definition
Formication is a specific type of tactile hallucination characterized by the false sensation of insects, worms, or other small creatures crawling on or under the skin. This symptom can occur in various psychiatric and medical conditions, including substance use disorders (particularly stimulant intoxication or withdrawal), delusional parasitosis, and certain neurological conditions. The term derives from the Latin word 'formica' meaning ant. Patients often engage in excessive scratching or picking behaviors in response to these sensations, potentially causing secondary skin damage.
Usage
Usage note: Often misspelled as 'fornication'. Emphasize the medical nature when documenting.
In Context
- "The patient reported formication and had multiple excoriation marks from scratching." — substance abuse assessment
- "Formication is a common symptom during methamphetamine withdrawal." — clinical education material