Eli5..if cell turnover occurs every 28-50 days…why do scars/hyperpigmentation remain,

Question

Particularly rolling acne scars and hyperpigmentation on the face.

I understand why deep scars/tattoos remain.

However, thought shallow scars and light sun spots would fad with a few months of cell turnover?

In: 20

Answer 1

Not all cells turn over in that time. That is an average, but cells under the skin turn over slower. Plus, the genes in the new cells will remain the same, so they will produce the same result.