noun
pore
POR/pɔːr/
A tiny opening in a surface.
Tiny pores dot the surface of the skin.

Etymology
Greek poros meant a “passage” or “way” as well as a pore. A tiny opening in skin or another surface is thus named as a small passage through it.
In context
The excess oil and dead cells stick together forming a plug inside the hair follicle. This plug blocks the pore, trapping oil, bacteria, and debris inside.
More examples
- Oil and dead skin cells can clog a pore.
- Leaves exchange gases through tiny pores.
- Water seeps into the pores of the stone.
Forms
pore · pores
porous adjective — Having tiny openings that let substances through.