Yep, skin sheds over time so the ones that added melanin to protect from future sun exposure are lost, and the new ones that formed when you weren't in the sun as much aren't expecting to need that extra melanin. (Melanin is what makes skin brown and reduces the risk of sunburn)

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So I got a sunburn this summer. The lines on the top of my legs were very bright. The line on my left leg is still visible. How long is a skin cell life cycle?

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Not a complete answer, however- if some cells are more damaged by the sunburn, they might get replaced faster

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Does skin shed ? lol hell yes !

https://health.howstuffworks.com/skin-care/information/anatomy/shed-skin-cells.htm

What causes dead skin cells?

New skin cells gradually push their way to the top layer. When they reach the top, they die and are "weathered" by the environment and your daily activities before they eventually fall off.

How long is a skin cycle?

Skin regenerates itself approximately every 28 days or four weeks.

How many skin cells do we shed a day?

Over a 24-hour period, you shed almost a million skin cells.

How many skin cells do we shed in one hour?

Between 30,000 and 40,000 skin cells fall off every hour.

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When you dust, you are just cleaning up after yourself and the things that spend there whole life eating you.

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Wasn't the 'dust is mostly dead skin cells' idea debunked?

That is why I included the other stuff. There are generations of exoskeletons from things crawling around on your skin, eyelashes, other hair, under your toes nails...