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The wild-type dominant A causes the banding and thus an overall lightening effect on the hair, while the recessive non-agouti or "hypermelanistic" allele a does not initiate this shift in the pigmentation pathway. As a result, homozygous aa have pigment production throughout the entire growth cycle of the hair and therefore along its full ...
Non scarring hair loss, also known as noncicatricial alopecia is the loss of hair without any scarring being present. [1] There is typically little inflammation and irritation, but hair loss is significant. This is in contrast to scarring hair loss during which hair follicles are replaced with scar tissue as a result of inflammation.
A woman with dark skin. Dark skin is a type of human skin color that is rich in melanin pigments. [1] [2] [3] People with dark skin are often referred to as black people, [4] although this usage can be ambiguous in some countries where it is also used to specifically refer to different ethnic groups or populations.
Postinflammatory hyperpigmentation (PIH) is a skin condition characterized by the darkening of the skin (hyperpigmentation) following an inflammatory injury, such as acne, dermatitis, infectious disease, or trauma. Less frequently, it may occur as a complication of a medical procedure performed on the skin. It is a common cause of skin ...
Blue-ish pigmentation of lower extremities, but can also involve the entire nail bed, nose, cheeks, forehead, ears, and oral mucosa: Psychotropic Drugs: Blue-gray pigmentation on sun-exposed areas Amiodarone: Blue-gray pigmentation on sun-exposed areas and yellow stippling of cornea: Tetracyclines: Brown pigmentation, most often on teeth: Heavy ...
People with OCA2 generally have more pigment and better vision than those with OCA1, but cannot tan like some with OCA1b. A little pigment can develop in freckles or moles. [9] People with OCA2 usually have fair skin, but are often not as pale as OCA1. They have pale blonde to golden, strawberry blonde, or even brown hair, and most commonly ...
Nevus depigmentosus is a loss of pigment in the skin which can be easily differentiated from vitiligo.Although age factor has not much involvement in the nevus depigmentosus but in about 19% of the cases these are noted at birth.
Pigment dispersion syndrome (PDS) is an eye disorder that can lead to a form of glaucoma known as pigmentary glaucoma. It takes place when pigment cells slough off from the back of the iris and float around in the aqueous humor .