If the cells of our skin are replaced regularly, why do scars and tattoos persist indefinitely?
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Answers:
the skin cells are replaced regularly but each layer of all our skin layers( we have 6) only the first replaces itself. scars and tattoos are around all 6 layers. Your skin cells recognize the color because when scars and tattoo are made, it gets into the blood stream, which gets into your Deoxyribo Nucleic Acid (DNA), so it remebers the location of the "stain" in your skin and thinks it is naturally supposed to be there. Tattoos do fade if around chlorine and sunlight, not from age.
It's only the top layer that is replaced. Mederma is supposed to reduce scars- no matter how old the scar is.
Scars and tattoos are developed into the dermis. The epidermis the the only layer that does shedding.
scars and tattoos are not part of our skin,,they were put on them artificially unlike scabs or wounds and as such they require artificial means of removal.
It's a very interesting question. The body is made up of a huge number of systems, and, although collectively these contribute to keeping you alive, they don't necessarily need to know about one another. The systems that tell your body that it needs to plug up a leak (cut) by growing new skin over it do not have the broad perspective to realize repairing the leak to the exact visual manner as before the leak. They don't have to. Evolution did not need to waste time selecting for those sorts of systems. If the leak got plugged up, and the creature survived, that was good enough.
About scars, when the skin layer cells are destroyed and dead, there won't be any regeneration in that area.
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