Dark spots on the skin. Hyperpigmentation is primarily a cosmetic concern that can be covered with make-up, although in some cases (such as the café au lait spots associated with neurofibromatosis) it can be a sign of an underlying medical problem. If treatment of hyperpigmentation is desired, a dermatologist may be able to use dermabrasion, laser treatments, or bleaching agents to effect change.
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An excess of pigment in a tissue or part.

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hy·per·pig·men·ta·tion -.pig-mən-'tā-shən, -.men- n excess pigmentation in a bodily part or tissue (as the skin) <\hyperpigmentation of deep inflammatory acne lesions (Elizabeth A. Abel )(et al)>
hy·per·pig·ment·ed -'pig-mənt-əd, -.ment- adj

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hy·per·pig·men·ta·tion (hi″pər-pig″mən-taґshən) abnormally increased pigmentation, such as of the skin or a mucous membrane.

Medical dictionary. 2011.

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