> Sunburn is triggered when your DNA is damaged from light absorption [...] This interferes with protein synthesis and wreaks havoc in your body over time

Not a skin-scientist, but this seems misleading: Sunburn is not caused by bad DNA floating around, nor damaged cells pumping out flawed proteins to annoy their neighbors.

Rather, your cells have techniques to measure their exposure, and when they detect that DNA damage might have occurred, well-behaved ones trigger a variety of self-destruct mechanisms, to mitigate the risk they might turn into a cancer.

So the sunburn you see and feel is from cells signalling "I can't be trusted, recycle me" to your immune-system, and the attendant bustle of cleanup-tasks and a heightened security measures.