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I don't think it avoids it at all. First ppl would be black, it suits the environment, high UV exposure, you need skin that can withstand the conditions. Migration to environments with less UV exposure leads less of a need for UV protection, and you won't need as much sun light for something like vitamin D production (from UV exposure).
http://anthro.palomar.edu/adapt/adapt_4.htm
http://anthro.palomar.edu/adapt/adapt_4.htm