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Per square micron skin melanoma skin cells due to the number of different sites vary widely.

For each individual speaking, the classification between the two pigment is different, this is also the reason of the world have different complexions. Different ethnic of the number and size melanin, different considerably, which determines the characteristics of different colour. This is of course from congenital determined by the genes.

White people, less melanin cells, and melanin particles small and scattered, not tanning.

Yellow people, melanin cells relative more, but melanin particles larger and more, easily tanning.

Black people, melanin cells more, melanin particles great, colour all along dark.

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