Are these razor bumps or ingrown hairs? What’s the difference between razor bumps and ingrown hairs?

Razor bumps are a type of ingrown hairs.  There are essentially two ways hairs get trapped in your skin, creating bumps: transfollicular penetration and extrafollicular penetration.  Transfollicular penetration occurs when the hair enters the skin without ever growing above the skin.  It gets trapped before it has a chance to.  With extrafollicular penetration (razor bumps), the hair has had a chance to grow above the skin, but it curls up and grows back into it.

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