noun
a medical condition characterized by the darkening of an area of skin due to an excess of melanin
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Hyperpigmentation is a common skin condition characterized by dark patches on the skin.
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I have been trying different products to lighten my hyperpigmentation.
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My hyperpigmentation is really bothering me, I need to find a solution.
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Her past mistakes left a mark on her life, like a form of emotional hyperpigmentation.