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The last generation of humans with fur [hairs] are said to have had light-colored covered with black hairs, similar to that of their relatives, the chimpanzees.
As they lost their body hair to adapt to the sunny environment of Africa, their skin darkened. This was intended to protect them from harmful solar radiation.
This dark, melanin-rich skin is generally considered the original skin color of modern humans.
Later, 60,000 to 70,000 years ago, as humans left Africa and moved to less sunny areas, they began to develop lighter skin.
This adaptation was a natural measure to help them maximize vitamin D synthesis in an environment lacking sufficient sunlight.
