To guard against such harmful effects, the human skin with the production of melanin, a substance that prevents most harmful solar radiation to penetrate the skin. Melanin is what gives the dark color to the skin and its production is stimulated by the effect of sunlight or chemicals. The number of cells that produce this substance varies according to skin types. People is highest in blacks, and lowest in whites, and among them, the lighter skins are the most susceptible to the effects of the sun.

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