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Acanthosis nigricans is a medical sign characterised by brown-to-black, poorly defined, velvety hyperpigmentation of the skin. [1] It is usually found in body folds, [2] such as the posterior and lateral folds of the neck, the armpits, groin, navel, forehead and other areas. [1]
Mongolian spot is a congenital developmental condition—that is, one existing from birth—exclusively involving the skin.The blue colour is caused by melanocytes, melanin-containing cells, that are usually located in the surface of the skin (the epidermis), but are in the deeper region (the dermis) in the location of the spot. [6]
The underface of each hindwing shows a pair of small black eye-spots beside each tail, with an orange marginal spots at the anal angle. [10] This species is rather similar and it can be confused with Leptotes pirithous and Cacyreus marshalli although the pea-blue is significantly larger than both species. Male.
Melasma affects up to 33 percent of men and women. Read on to learn what causes the chronic skin condition and what you can do to keep it at bay.
The distinctive solid black colour of the Ayam Cemani (rooster shown) chicken breed is due to hyperpigmentation, with the bird's feathers, skin, beak and internal organs all being affected. Hyperpigmentation can be caused by sun damage, inflammation , or other skin injuries, including those related to acne vulgaris .
The head of a mantis showing the black pseudopupil in its compound eyes The eye of a mantis shrimp has three regions, each with its own pseudopupil.. In the compound eye of invertebrates such as insects and crustaceans, the pseudopupil appears as a dark spot which moves across the eye as the animal is rotated. [1]
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Central heterochromia, green with brown. Central heterochromia is also an eye condition where there are two colors in the same iris; but the arrangement is concentric, rather than sectoral. The central (pupillary) zone of the iris is a different color than the mid-peripheral (ciliary) zone.