hyperpigmentation
noun
hy·per·pig·men·ta·tion
ˌhī-pər-ˌpig-mən-ˈtā-shən 
-ˌmen-
: excess pigmentation in a bodily part or tissue (such as the skin)
Vitamin C has been reported to inhibit the production of melanin, the stuff that produces not only a tan but also freckles and hyperpigmentation.—
Anne Weintraub
Anne WeintraubThe presence of nickel can cause a skin rash that leads to hyperpigmentation, or darkening, of the skin.—Jenyne M. Raines
Jenyne M. RainesExamples of hyperpigmentation in a Sentence
Recent Examples on the Web
Here, argon-gas electrodes create a gentle current at up to 60 Hz, which helps to reduce the look of active pimples, calm visible redness, and even address the appearance of post-inflammatory hyperpigmentation.
—Deanna Pai, Vogue, 20 Jan. 2026
Glycolic acid is arguably the most popular recommendation among skin experts for its ability to brighten the skin, minimize the appearance of hyperpigmentation, and smooth rough texture over time.
—Jacqueline Kilikita, Refinery29, 20 Jan. 2026
Ginger improves circulation, which means less severe dark circles and improved hyperpigmentation.
—Tamim Alnuweiri, InStyle, 18 Jan. 2026
Systematic studies of blue light show that bacteria is killed between 405 and 420 nanometers; while a 2021 study out of the University of Lodz observed hyperpigmentation in skin with blue light between 423 and 450 nanometers, though much of it wasn’t permanent, researchers said.
—Brennan Kilbane, Allure, 15 Jan. 2026
See All Example Sentences for hyperpigmentation
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Deanna Pai, Vogue, 20 Jan. 2026
Glycolic acid is arguably the most popular recommendation among skin experts for its ability to brighten the skin, minimize the appearance of hyperpigmentation, and smooth rough texture over time.
—Jacqueline Kilikita, Refinery29, 20 Jan. 2026
Ginger improves circulation, which means less severe dark circles and improved hyperpigmentation.
—Tamim Alnuweiri, InStyle, 18 Jan. 2026
Systematic studies of blue light show that bacteria is killed between 405 and 420 nanometers; while a 2021 study out of the University of Lodz observed hyperpigmentation in skin with blue light between 423 and 450 nanometers, though much of it wasn’t permanent, researchers said.
—Brennan Kilbane, Allure, 15 Jan. 2026
See All Example Sentences for hyperpigmentation
Cite this Entry
“Hyperpigmentation.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hyperpigmentation. Accessed 28 Jan. 2026.
Copy CitationMedical Definition
hyperpigmentation
noun
hy·per·pig·men·ta·tion
-ˌpig-mən-ˈtā-shən, -ˌmen-
: excess pigmentation in a body part or tissue (as the skin)
hyperpigmentation of deep inflammatory acne lesions—Elizabeth A. Abel et al.
Elizabeth A. Abel et al.Love words? Need even more definitions?
Merriam-Webster unabridged
