Sebaceous Filament / Skin Plug (Not an insect)

Human skin, typically found in pores on the face, nose, or back.

N/A (This is a collection of sebum and dead skin cells, not a living organism)

Stationary. These naturally form within hair follicles as oil (sebum) and dead skin cells accumulate.

Harmless biological function. They help channel oil to the skin's surface for moisturizing, though they are often mistaken for blackheads or parasites by laypeople.