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  2. Hypopigmentation - Wikipedia

    en.wikipedia.org/wiki/Hypopigmentation

    It is caused by melanocyte or melanin depletion, or a decrease in the amino acid tyrosine, which is used by melanocytes to make melanin. [2] Some common genetic causes include mutations in the tyrosinase gene or OCA2 gene. [3] [4] As melanin pigments tend to be in the skin, eye, and hair, these are the commonly affected areas in those with ...

  3. Dealing with Weird Dark Patches? Melasma May Be the ... - AOL

    www.aol.com/dealing-weird-dark-patches-melasma...

    Tyrosine in the skin is converted into melanin, which is the pigment that darkens skin by way of an enzyme called tyrosinase. Vitamin C inhibits that enzyme so less melanin is made so the skin ...

  4. Oculocutaneous albinism - Wikipedia

    en.wikipedia.org/wiki/Oculocutaneous_albinism

    Oculocutaneous albinism is a form of albinism involving the eyes , the skin (-cutaneous), and the hair. [1] Overall, an estimated 1 in 20,000 people worldwide are born with oculocutaneous albinism. [1] OCA is caused by mutations in several genes that control the synthesis of melanin within the melanocytes. [2]

  5. Why your hair and eye colors change

    www.aol.com/news/2014-07-23-why-your-hair-and...

    The color of the melanin in the eyes is determined by three other genes, EYCL1, 2 and 3. Together, they account for brown, green and blue, but not hazel or grey eyes. Science is still working on ...

  6. Amelanism - Wikipedia

    en.wikipedia.org/wiki/Amelanism

    The appearance of an amelanistic animal depends on the remaining non-melanin pigments. The opposite of amelanism is melanism, a higher percentage of melanin. [citation needed] A similar condition, albinism, is a hereditary condition characterised in animals by the absence of pigment in the eyes, skin, hair, scales, feathers or cuticle. [1]

  7. Leucism - Wikipedia

    en.wikipedia.org/wiki/Leucism

    Both the eyes and legs are still of the normal colour. Leucism (/ ˈ l uː s ɪ z əm,-k ɪ z-/) [2] [3] [4] is a wide variety of conditions that result in partial loss of pigmentation in an animal—causing white, pale, or patchy coloration of the skin, hair, feathers, scales, or cuticles, but not the eyes. [4] It is occasionally spelled leukism.

  8. Evolution of color vision in primates - Wikipedia

    en.wikipedia.org/wiki/Evolution_of_color_vision...

    Howler monkeys are perhaps the most folivorous of the New World monkeys. Fruits make up a relatively small portion of their diet, [30] and the type of leaves they consume (young, nutritive, digestible, often reddish in color), are best detected by a red-green signal. Field work exploring the dietary preferences of howler monkeys suggest that ...

  9. The best skin care routine for your 50s, according to ... - AOL

    www.aol.com/lifestyle/best-skin-care-routine-for...

    "As the skin produces less oil in your 50s, it becomes drier and may be more sensitive," she said. "Look for hydrating cleansers and moisturizers that contain hyaluronic acid, glycerin and ceramides.