PBS / ayoutube.com They're called Demodex, and they feast on the greasy oil (sebum) in your pores! These microscopic 8-legged arachnids are related to ticks and spiders. They don't have an anus or eyes. It's more than likely that you have dozens of them on you at this very minute. They spend most of their time near your hair follicles. They "crawl out to the surface and mate, before crawling back into your pores to lay their eggs." It's impossible to truly rid your body of all of them, so don't waste your time trying.