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Acanthosis nigricans. 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. [1]
Causes. Autoimmune diseases, hyperlipidemia, poisons, drug abuse. Livedo reticularis is a common skin finding consisting of a mottled reticulated vascular pattern that appears as a lace-like purplish discoloration of the skin. [1] The discoloration is caused by reduction in blood flow (ischemia) through the arterioles that supply the cutaneous ...
The pattern of the eruption changes, with slow extension and often some clearing of the original lesions. Schamberg's disease, or progressive pigmented purpuric dermatosis, is a chronic discoloration of the skin which usually affects the legs and often spreads slowly. This disease is more common in males and may occur at any age from childhood ...
Medical genetics. Named after. Donovan James McCune. Fuller Albright. McCune–Albright syndrome is a complex genetic disorder affecting the bone, skin and endocrine systems. It is a mosaic disease arising from somatic activating mutations in GNAS, which encodes the alpha-subunit of the G s heterotrimeric G protein. [1]
Drug-induced pigmentation of the skin may occur as a consequence of drug administration, and the mechanism may be postinflammatory hyperpigmentation in some cases, but frequently is related to actual deposition of the offending drug in the skin. [ 2]: 125–6 The incidence of this change varies, and depends on the type of medication involved.
Hyperpigmentation refers to spots or patches on the skin that are darker than the surrounding skin. It can occur anywhere on the body but is most common on the face. Sun exposure, hormonal changes ...
Incontinentia pigmenti. This condition is inherited in an X-linked dominant manner. Incontinentia pigmenti (IP) is a rare X-linked dominant genetic disorder that affects the skin, hair, teeth, nails and central nervous system. It is named from its appearance under a microscope. [1]
Clarias cavernicola. The cave catfish[2] (Clarias cavernicola) [3] is a critically endangered species of airbreathing catfish. [4] This cavefish is only known to live in the Aigamas cave, Otjozondjupa region, Namibia. [5][6] It has also been reported from the nearby Dragon's Breath Cave. [7] The golden cave catfish lack pigmentation and are up ...