Matchbox sign

Psychiatric medical sign

The matchbox sign, also referred to as the Ziploc bag sign or the specimen sign, is a psychiatric medical sign in which a patient arrives at a doctor's office with items extracted from the skin; these items are intended to serve as proof of a parasitic infestation, and are typically stored in a small container such as a matchbox. 50–80% of patients with delusional parasitosis present with this sign.

This keyword could refer to multiple things. Here are some suggestions: