How Can I Tell If the Sun Is Damaging My Skin?

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So of course there's outwards signs like freckles and wrinkles and things like that, that you can tell that the sun is damaging the skin, but there's this very cool machine called VISIA, and what it does is, it takes these pictures using polarized light and ultraviolet light and shows you what's going on deeper down below the surface of the skin, whether I can see and that gives you a much more broad picture of what your mainn concerns are in tan damage.

And some doctors have some don't, but it's probably easy to find if you look it up.