Dr. Scott Walter, a dermatologist from Denver, recently went viral explaining the surprising presence of Demodex mites, tiny eight-legged creatures that live on our faces. “They come out at night to eat our dead skin cells and mate,” Walter shared on TikTok, noting their ability to sense light as a cue to emerge. Almost everyone has these mites, particularly in areas with hair follicles like the eyebrows and eyelashes, and they are especially common in adults.