Pores are small openings in the skin that are connected to hair follicles, sweat glands and oil glands. They are necessary for body temperature regulation, the secretion of toxins, and keeping the skin moisturised. In general, pores are quite small and barely noticeable, but in some cases they can become enlarged. Enlarged pores give the appearance of pits in the skin; resulting in an uneven skin tone.
Enlarged pores are most prominent on the nose, chin and cheeks, making them very hard to conceal. Makeup tends to cling to the pores, highlighting them rather than hiding them, and clogging the pore to make their appearance worse.