As pores aren't muscles, they don't have the ability to contract, so they cannot open or close. Entière Dermatology founder Dr. Melissa Kanchanapoomi Levin told Harper's Bazaar, "I think people tend to react to transient changes that you can see from your blood vessels opening and closing. It has nothing to do with the actual pore itself."
Nonetheless, pores can appear more noticeable — you aren't imagining it. Dr. Mona Gohara, who works as an associate clinical professor of dermatology at the Yale School of Medicine, explained to Harper's Bazaar why different people have different pore sizes. "Genetics, sun damage — if the collagen around the pore loosens, they can stretch out," she said.
Levin also noted that any type of treatment that causes skin trauma can result in a plumper looking face. "Any sort of procedure like microdermabrasion, microneedling, some sort of heat-based technology, is going to make your pores look smaller just because there's more edema or swelling," the dermatologist said.
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