Ingrown hair (appearing as a coiled fiber)

Found within or on the surface of human skin, particularly in areas with coarse or curly hair.

None; it is composed of keratinized protein from the human body.

Occurs when a hair strand tilts and grows sideways or curls back into the skin instead of rising through it.

Usually harmless, but can cause localized inflammation, redness, or infection (folliculitis). Not an insect or parasite.