What is an ingrown hair?

If you've never had one in your life, this is it. The most gross, disgusting and terrifying ingrown hair you have ever seen. It's not uncommon to get ingrown hairs, especially after shaving, but who knows what happened here. Sometimes when you have them they turn into aa pimple-like form where there is puss surrounding the hair under the skin and it takes weeks or even months to even show--all while the hair is still growing under the skin.

What's the longest ingrown hair that you have ever seen?

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