Sebum Plug / Keratin Plug (Not actually a bug)

Found in human hair follicles, particularly on the face, scalp, or upper arms.

N/A (This is accumulated oil, dead skin cells, and bacteria, not a living organism).

These form when sebum (oil) and keratin (skin protein) accumulate and harden inside a pore. They are stationary and do not move. They are often expelled or squeezed out of pores.

Risks: Can lead to acne, blackheads, or enlarged pores if they become infected or very large. Benefits: None, strictly speaking, though sebum itself moisturizes skin. This object is frequently mistaken for a parasitic worm or mite by individuals, but it is benign biological debris.