Holy crap. File this away under things you desperately wish you could un-know: lurking in your pores right now are tiny bugs, closely related to spiders, that live off your facial oils. Usually, these bugs are harmless, but harbor too many of them and their tendency to die and decompose while they're inside you becomes a little problematic. In fact, according to National University of Ireland researcher Kevin Kavanagh, the bugs may be responsible for rosacea, a chronic skin disease estimated to effect between 5 and 20 percent of the world's population.
Tiny mites – eight-legged arachnids related to spiders – live in the pores of our facial skin. They are particularly fond of the hair follicles of eyebrows and eyelashes, and the oily pores most common on the nose, forehead and cheeks. Called Demodex, the mites eat sebum, or facial oil, and colonise your face at puberty.
They crawl about your face in the dark to mate, then crawl back into pores to lay their eggs and die. Healthy adults have around one or two mites per square centimetre of facial skin. People with rosacea, however, can have 10 times as many, says Kavanagh. Research suggests that the stress that causes flare-ups of rosacea changes the chemicals in sebum, making it better food for mites.
Demodex does not have an anus and therefore cannot get rid of its faeces. "Their abdomen just gets bigger and bigger, and when they die and decompose they release their faeces all at once in the pore," says Kavanagh. When the mites are numerous, he believes that the material is enough to trigger an immune reaction, inflammation and tissue damage.
Emphasis mine. Because blahrf. Just when you thought it was safe to let tiny bugs die and waste away inside your face-holes, amirite?
Read more about Kavanagh's hair-raising research and findings over at New Scientist, if you can stomach it; I don't say this often, but some things may be better left unknown.