Yep, you probably have Demodex mites living on your face. These tiny arachnids feast on sebum, the greasy oil in your pores. But should you be worried about your eight-legged guests?

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DEEP LOOK is a ultra-HD (4K) short video series created by KQED San Francisco and presented by PBS Digital Studios. See the unseen at the very edge of our visible world. Explore big scientific mysteries by going incredibly small.

Pretty much every adult human alive has a population of these mites living on them.

Also called eyelash mites, they’re too small to see with the naked eye. They’re mostly transparent, and at about .3 millimeters long, it would take about five face adult mites laid end to end to stretch across the head of a pin.

Face mites spend their days face-down inside your hair follicles nestled up against the hair shaft.
They eat sebum, that greasy oil your skin makes to protect itself and keep it from drying…