Hyperpigmentation

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

Hyperpigmentation is a condition characterized by the darkening of an area of the skin or nails due to an excess production of melanin, the pigment responsible for skin color.

Excerpt from the Wikipedia article “Hyperpigmentation”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Shaimaa Abdellatif, CC BY-SA 4.0, via Wikimedia Commons.