How to evolve blue skin?

So, I understand that human skin color is based on the distance from the equator, but would it be possible to evolve skin to be a non-natural color such as green, pink, blue, purple, ect? Perhaps if it would not be possible on Earth, would it be possible on another planet with a different climate? What gives skin pigment, anyway? Does blood alter the color of skin? Does our red blood make us look pink? I'm sorry, that's a bit off track. Help?

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How to evolve blue skin?

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