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Poliosis circumscripta, commonly referred to as a "white forelock", is a condition characterized by localized patches of white hair due to a reduction or absence of melanin in hair follicles. Although traditionally associated with the scalp, poliosis can affect any hairy area on the body, including eyebrows, eyelashes, and beards.
Generally, the East Asian, Central Asian and Native American population has straight hair with a very thick cuticle layer [5] and South Asians have thick, wavy or curly hair, [6] while the general hair type seen in black African hair is thick, curly and dense with more hair growing from the head. The curly quality comes from the shape of the ...
Pheomelanin colors hair orange and red. Eumelanin, which has two subtypes of black or brown, determines the darkness of the hair color; [4] more black eumelanin leads to blacker hair and more brown eumelanin to browner hair. [6] All human hair has some amount of both pigments. [9] Over 95% of melanin content in black and brown hair is eumelanin ...
In 2002, Whitkop and other scientists examined patients born with white hair, some black locks, and depigmented skin; he diagnosed them as having black lock albinism deafness syndrome (BADS). [1] Those who were closely working with this case suggested that it was an autoimmune disorder rather than a genetic defect.
The lesions are most frequent on the lower limbs, but may occur anywhere on the body, including the hands, arms, torso and even the neck. They may vary in number and erupt in mass numbers. They consist of irregular patches of orange or brown pigmentation with characteristic "cayenne pepper" spots appearing within and at the edge of old lesions.
Both men and women coated their hair with a strong acid that stripped the outer layer and altered the shape of the hair shaft, causing it to "relax" or straighten, [49] and the longer the chemical was left on the hair, the straighter the hair would become. If left on the hair too long, the relaxer could burn the scalp and cause sores to form.
Commonly, alopecia areata involves hair loss in one or more round spots on the scalp. [22] [37] Hair may also be lost more diffusely over the whole scalp, in which case the condition is called diffuse alopecia areata. [22] Alopecia areata monolocularis describes baldness in only one spot. It may occur anywhere on the head.
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.