A disturbing video from the YouTube channel "Journey to the Microcosm" shows the small mites called Demodex, which live on the faces of most humans. During the day they eat our skin and fat cells and at night they have sex with each other.

Most of us have these mites on our faces, according to the researchers. Because they live in our pores they are very difficult to get rid of. People may have a large amount of them on their faces, creating a shine that some doctors call "demodectic frost"