hair: Quick Facts

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Shih tzu dog with a long, flowing, groomed coat and topknot trots on grass, its hair brushed smoothly for the show ring.

Detailed cross-section illustration of human skin showing layers including the epidermis, dermis, and subcutaneous fat, with labeled structures such as hair, pores, sweat gland, oil gland, nerves, blood vessels, and hair follicle.

A black-and-white photo of a white man from the late 19th century wearing an extremely long mustache. Cut-out hands hold a blue razor to the right side of the image.

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