If all skin cells are regenerated every month or so. Why don’t scars go away. If not in a month then surely by a year all marks on skin should go away right. But some scars are permanent.
In: Biology
If you have some extra time, the [scar wiki page](https://en.wikipedia.org/wiki/Scar) has a bunch of different cases and definitions that might be interesting to you.
But for ELI5, when you get hurt you no longer have your flesh in its right place. Your body can replace that flesh, but because it can’t replace the middle parts before all the edges of the wound are fixed, it can only fix it in a certain way. That certain way ends up in scars, instead of the original flesh.
Consider a blanket with a hole in it. If you could only repair it by adding threads to the edges of the hole (instead of using a patch), then the repair would feel different than the rest of the blanket (even if you used the same kind of threads the blanket is made out of).
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