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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.
Hyperpigmentation is a condition that causes the skin to darken. It can occur in small patches or cover large areas of the body. It can also affect the entire body. Hyperpigmentation is usually not harmful.But it can be a symptom of another medical condition.ypes of Hyperpigmentation. There are several types of hyperpigmentation. 1  Melasma is believed to be caused by hormonal changes. 2  It commonly develops during pregnancy. 3  Areas of hyperpigmentation can appear on any area of the body. 4  They are most common on the abdomen and face. 5  Sunspots, or solar lentigines, are common.