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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.
The rash is extremely itchy and can turn dark purple, black, or gray on darker skin tones and is commonly found on the elbows and back of knees, she adds. The rash can also cause tenderness or ...
Lichen nitidus is a chronic inflammatory disease of unknown cause [1] characterized by 1–2 mm, discrete and uniform, shiny, flat-topped, pale flesh-colored or reddish-brown papules [2] [3] that may appear as hypopigmented against dark skin.
Gottron's sign is a pathognomonic cutaneous manifestation associated with dermatomyositis (DM), which is an inflammatory disorder affecting the skin and muscles. [1] The primary lesion of dermatomyositis appears as a violaceous, macular erythema with a symmetric distribution, which may progress and become poikilodermatous (atrophic with telangiectasia and pigmentary changes) and indurated (as ...
In short, melasma is a chronic skin condition that appears as darkened areas on the face due to an overproduction of melanin, says Gina Charles, MO, a family physician specializing in skincare. It ...
Elbows, knees, back or buttocks Erythema nodosum: Large red bumps that seem to bruise and are tender to touch Anywhere Psoriasis: White, scaly rash over red, flaky, irritated skin Elbows and knees Erythema multiforme: Red, blotchy rash, with "target like" hives or sores. Anywhere Measles: Red rash that is raised with a fever or sore throat.
Other areas of skin appear normal. The skin is fragile and is prone to blistering (caused by mild trauma or sweating). [5] After a few months hyperkeratosis develops with a dark grey or brown, ridged appearance on the ankles, knees and elbows. [4] Palms and soles are generally unaffected. [3] A slightly unpleasant, sweet odour may be present. [2]
The skin weighs an average of four kilograms, covers an area of two square metres, and is made of three distinct layers: the epidermis, dermis, and subcutaneous tissue. [1] The two main types of human skin are: glabrous skin, the hairless skin on the palms and soles (also referred to as the "palmoplantar" surfaces), and hair-bearing skin. [3]