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Vitiligo (/ ˌ v ɪ t ɪ ˈ l aɪ ɡ oʊ /, vi-ti-leye-goh) is a chronic autoimmune disorder that causes patches of skin to lose pigment or color. [1] The cause of vitiligo is unknown, but it may be related to immune system changes, genetic factors, stress, or sun exposure.
Poliosis is present in half of patients with segmental vitiligo. [ 5 ] Vogt-Koyanagi-Harada Syndrome (VKH): VKH is a systemic autoimmune disorder affecting melanin-containing tissues, leading to uveitis , meningitis , and poliosis, which often involves the eyebrows and eyelashes.
In humans, the amount of melanin is determined by three dominant alleles (AABBCC), and different ethnicities have varying amounts. [33] Melanin is the primary determinant of the degree of skin pigmentation and protects the body from harmful ultraviolet radiation .
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The first World Vitiligo Day (also defined as “Vitiligo Awareness Day” or “Vitiligo Purple Fun day”, from the color chosen as Vitiligo Awareness Color [2]) was observed on June 25, 2011. The choice of June 25 as World Vitiligo Day is a memorial to musical artist Michael Jackson , who suffered from vitiligo from the early 1980s until his ...
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What they look like: Chiggers, a type of small mite, typically leave clusters of bites that are often very itchy. In many cases, chigger bites appear as small, red and itchy bumps. Sometimes, they ...