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Skin does not replace itself every 24 hours, it is replaces itself every 28 days, and for older people, it takes much longer of that to happen.

However, this is only half the story, the skin is consisted of two layers, the dermis and the epidermis, the dermis is the lower skin layer, while the epidermis is the upper layer of the skin that you see when you look in the mirror.

The epidermis is the one that take about 28 days to be replaced by a new layer, while the dermis takes roughly about 15 years to replace only half of it's contents.

When you get a wound and your skin forms a scar, this scar is formed in the dermis layer, hence why a scar or a tattoo will stay a lifetime.

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Q: If your skin replaces itself every 24 hours why do scars stay?
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