A pore was a hole in the skin of some humanoids.
Data also had pores, a fact he mentioned to Jean-Luc Picard while suffering from polywater intoxication in 2364. (TNG: "The Naked Now")
In 2368, while enjoying a mud bath, Lwaxana Troi told Alexander Rozhenko that every pore in her body was tingling with contentment. (TNG: "Cost of Living")