Really. Tiny mites live in the roots of your eyelashes. They live head-down, feeding on secretions and dead skin debris.
If you have oily skin, use heavy cosmetics, and don't wash thoroughly you'll be home to a herd of these little beasts. But all of us carry a few Demodicids, no matter how good your hygiene.
An individual female may lay up to 25 eggs in a single follicle, and as the not-so-cuddly mites grow, they become tightly packed. When mature, they leave home, mate, and find a new follicle in which to lay their eggs. The whole cycle takes between 14 to 18 days.
Still, Demodex are harmless and don't transmit diseases, although if you allow big colonies to grow they can cause itching and skin problems.
While what goes up must come down, as they say, but what goes in does not necessarily have to come out. You'll be glad to know these guy's digestive system works so good they don't poop...they don't even have an anal opening. In fact, they help keep our home clean by munching the millions of skin cells we shed each day. (About 80 percent of the material seen floating in a sunbeam is actually skin flakes.)
Just try not to think about the fact that your pillow is home to 10,000 to 400,000 of their little buddies called Dermatophagoides pteronyssinus - flesh-eating pillow mites. Ten percent of the weight of a two year old pillow can be composed of dead mites and their droppings--they do poop.