Pores are openings in the skin that contain either hair follicles or sweat glands. These openings in your skin help to regulate temperature and generally do its thing. All healthy pores make a certain amount of Keratin, the protein that makes up your hair, skin, and nails, and sebum, natural oil from your skin. The skin underneath and in-between pores help us with a network of collagen and elastin which provide us skin structure.
Sometimes this pore lining doesn't appropriately shed, eventually building up dead skin cells. If you have oily skin, dead skin cells inside the pore can combine with oil buildup; forming the plug that becomes a comedone. As very well known, a comedone can be closed and appear as a whitehead, or it can open, which the sebum and dead skin combo usually oxidize, resulting in a blackhead.
One of the recommended way to accelerate cell buildup along with regulating sebum production is to use BHAs. These acids are oil-soluble which can reach deeper down into your skin to break down the sebum. BHAs do its job at keeping that cell lining healthy and free of excess oil.
Dehydrated skin tends to have enlarged-looking pores because of the skin around the pores probably lost its plumpness. Treating your skin with ultimate hydration will make your pores appear smaller. The more your skin is hydrated, the plumper the surrounding skin will become. To ensure that you are hydrating enough, don't forget to do sheet masks at least twice a week.