Eliminating and Preventing Sun Damage

What are the best ways to prevent previously incurred sun damage from manifesting. I have had a lot of sun damage from being a child to about my late teens. I have avoided the sun all through my twenties, but I am starting to see a few spots pop up. I want to do a treatment that will get rid of damage lurking beneath the surface as well as the current damage popping up now.I am 26 now. Any advice? Thanks.

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