WordNet
n. a hair that does not emerge from the follicle but remains embedded in the skin (usually causing inflammation)
Wikipedia
Ingrown hair is a condition where hair curls back or grows sideways into the skin. The condition is most prevalent among people who have coarse or curly hair. It may or may not be accompanied by an infection of the hair follicle ( folliculitis) or "razor bumps" ( pseudofolliculitis barbae), which vary in size. While ingrown hair most commonly appears in areas where the skin is shaved or waxed ( beard, legs, pubic region), it can appear anywhere. Anything which causes the hair to be broken off unevenly with a sharp tip can cause ingrown hairs. Shaving is the leading cause, followed by waxing and tight clothing.
Usage examples of "ingrown hair".
She's got crabs, and lice, and about eight billion venereal infections, and every ingrown hair and toenail usually develops into this oozing, life-threatening abscess.
I finally spotted it, a street about the size of an ingrown hair, off an equally obscure lane in the foothills that stretch across the back of town.
The Japanese-made sight was amazing and he could see tiny imperfections-like a pimple or an ingrown hair on the kids' individual faces.
What I was saying was I'd become a man with an ingrown hair that needed digging and tweezing.
One saw boils, pimples, ingrown hair, rashes, buboes, lesions, and skin rot of a severity and variety you'd expect to see in some jungle backwater.