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Black hair is the darkest and most common of all human hair colors globally, due to large populations with this trait. This hair type contains a much more dense quantity of eumelanin pigmentation in comparison to other hair colors, such as brown, blonde and red. [1]
Recent assertions that the term "black" has never been used in the Irish language to describe people have been brought into question, which does indeed use the term dubh to describe white people with swarthy features, [25] different from the use of gorm (literally "blue") to describe those with melanated skin. [26]
The most studied black hair gene is MC1R which causes the body to produce a protein called melanocortin. [3] This protein causes hair follicles to produce a type of melanin pigmentation called eumelanin. [3] Black hair has the highest concentration of this pigmentation with brown, blonde and red hair following behind. [3]
Woolly hair is a difficult to brush hair, usually present since birth and typically most severe in childhood. [1] It has extreme curls and kinks, occurs in black people and is distinct from afro-textured hair. [3] The hairs come together to form tight locks, unlike in afro-textured hair, where the hairs remain individual. [1]
Many treatments have been explored, including immunomodulatory agents such as imiquimod. [4] Tofacitinib citrate may also have benefits. In June 2014, a 25-year-old man with almost no hair on his body was reported to have grown a full head of hair, as well as eyebrows, eyelashes, and facial, armpit, and other hair, following eight months of treatment. [5]
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.
The excess hair is commonly referred to as malignant down. [13] This hair is very fine and unpigmented. [13] Generalized hypertrichosis Acquired generalized hypertrichosis commonly affects the cheeks, upper lip, and chin. [3] [4] This form also affects the forearms and legs, but is less common in these areas. Another deformity associated with ...
Uncombable hair syndrome (UHS) is a rare structural anomaly of the hair with a variable degree of effect. It is characterized by hair that is silvery, dry, frizzy, wiry, and impossible to comb. [4] It was first reported in the early 20th century. [5] It typically becomes apparent between the ages of 3 months and 12 years. [6]