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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.