Earlier quoted context omitted.
There are more mites specialized to live on your eyebrows skin than many like to think about. =3
Not just mites, we’re absolutely covered and full of commensal organisms. What’s really interesting is how specialized these organisms have become, like the difference between body and head lice. We have critters socialized to just our eyebrows and eyelashes, others only live in apocrine sweat glands, etc. Even before you get to the literal kilograms of bacteria, fungi and other fauna in our guts we’re a whole world…
If you think about the most commonly accepted history of eukaryotic life, it’s been this way from the beginning! Our cells themselves are bags of specialized microorganisms that changed and became integral to each other’s existence over time.