They can expand, dilate, or stretch when exposed to steaming, while working out, or when using pore-tackling products.
Additionally, steam won't cause your pores to open up like a door, but the heat can cause excess pore buildup to loosen and rise to the surface.
BLACKHEADS AREN’T DIRT-FILLED PORES.
Blackheads are not always dirt in your pores. This debris can be a buildup of dead skin cells and oil underneath the skin. A variety of factors like genetics, hormones, and skin type can cause this. It doesn’t always mean the skin is dirty.
Blackheads appear black / gray color because they’ve been exposed to the air and have oxidized.
YOU CAN’T SHRINK PORES PERMANENTLY.
The size of your pores is determined by genetics. You can definitely minimise the appearance of your pores by keeping your skin healthy, but you cannot permanently change the actual size of them. When there’s less oil in your pores, they can appear smaller.
THERE’S NOTHING WRONG WITH HAVING NATURALLY LARGE PORES.
Your pores help sebum and natural oils reach the surface of your skin to keep it moisturized. All pores - big or barely visible - all contribute to healthy skin!
In fact, there’s a benefit to having larger pores (which are common for Asian skin) since they can counteract the physical tolls of aging.