Well, how could we possibly know anything about "every" African individual during such a vast period of time? What we seem to know is that mankind once originated in Africa.
Skin color depends on climatic conditions. Living in the tropics and being exposed to heavy sunlight, man´s skin is naturally black or brown. The further away from the equator and the closer to the arctic poles, the sunlight, due to the Earth´s inclination, becomes less strong, more clothes have to be put on, and the skin (over the span of many generations) turns more pale in order to let into the body what faint sunlight is still available.
As Charles remarked, some people with lighter skin may of course have returned to Africa and resettled there, as did in later times some European settlers and colonists.
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© Charles N. Pope, US Library of Congress. All rights reserved.