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
The presence of nickel can cause a skin rash that leads to hyperpigmentation, or darkening, of the skin.—Jenyne M. Raines
Examples of hyperpigmentation in a Sentence
Recent Examples on the Web
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
More often than not, citric acid is combined with other exfoliating acids, like glycolic or lactic acid — both of which also brighten the skin, unclog pores, and minimize hyperpigmentation.
—Jacqueline Kilikita, Refinery29, 14 Jan. 2026
The transparent, cooling, jelly-like formula features niacinamide, a form of vitamin B that smooths uneven texture and fades hyperpigmentation.
—Sophie Wirt, InStyle, 5 Jan. 2026
The products are targeted for women over the age of 35 and inspired by Sims’ own battle with hyperpigmentation.
—Madeleine Marr, Miami Herald, 30 Dec. 2025
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Cite this Entry
“Hyperpigmentation.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hyperpigmentation. Accessed 20 Jan. 2026.
Medical 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.
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