What happens to the tiny bits of minerals, like sand, when they enter deep into your fingernails?

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What happens to the tiny bits of minerals, like sand, when they enter deep into your fingernails?

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So under the bottom of your nails, near the cuticle, is a patch of skin called the nail bed. This is constantly making new skin, and new nail. The skin and the nail grow forwards together. When they separate at the end, the skin cells die off, and fall off as dead skin flakes.

If you get stuff stuck deep in under your nails, it will get carried out by this process.