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Causes of Human Skin Hyperpigmentation. The color of human skin is due primarily to the production of melanin by specialized cells in the skin called melanocytes. Melanin produced by these cells both absorbs and scatters UV radiation and thus protects skin from the damaging and mutagenic effects of the solar radiation.
In hyperpigmentation, the skin either produces too much pigment or the pigment is deposited deep within the skin, resulting in dark spots. When color is lost, it's called hypopigmentation, which results in light-colored patches. All people with dark skin are at risk for both skin conditions. Among the most common types of pigment problems in dark skin is post-inflammatory hyperpigmentation. This occurs as a result of skin injury, such as a cut, scrape, or burn. It can also occur in conjunction with eczema or acne.