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Reference.org
Hyperpigmentation
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<p>Hyperpigmentation, also known as the dark spots or circles on the skin, is the darkening of an area of <a href="/facts/Human_skin/cfRXQwSs">skin</a> or <a href="/facts/Nail_(anatomy)/s3GJf9R2">nails</a> caused by increased <a href="/facts/Melanin/QtGsXAm4">melanin</a>. </p>