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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.
A skin abnormality known as acanthosis nigricans, which involves a discoloration (hyperpigmentation) and "velvety" thickening (hyperkeratosis) of the skin around skin fold regions of the neck, groin and under arms is also a common symptom. [1] Symptoms will negatively impact the daily life of the patient, and will persist until treated.
Crouzonodermoskeletal syndrome is a disorder characterized by the premature joining of certain bones of the skull (craniosynostosis) during development and a skin condition called acanthosis nigricans. [1] Some of the signs and symptoms of Crouzonodermoskeletal syndrome are similar to those seen with Crouzon syndrome.
Acanthosis nigricans-muscle cramps-acral enlargement syndrome, also known as Acanthosis nigricans-insulin resistance-muscle cramps-acral enlargement syndrome is an extremely rare genetic disorder which is characterized by the appearance of acanthosis nigricans, insulin resistance, muscle cramps of severe intensity, and acral hypertrophy ...
The causes of the HAIR-AN syndrome are not fully understood. Some studies hypothesize that the HAIR-AN syndrome is caused by a combination of genetic and environmental factors. [7] [1] HAIR-AN is found in 1-3% women affected hyperandrogenism. [8] Other studies have proposed the SAHA syndrome as a cause of the HAIR-AN syndrome. [9]
Acanthosis nigricans is a skin condition in which areas of the skin is of a dark and velvety discoloration, often seen in the body folds and creases such as the armpits, groin, and neck. [6] Within those affected by SADDAN, acanthosis nigricans develops early on, usually in infancy or early childhood. [4]
In some cases, paraneoplastic acanthosis nigricans (35% of patients), florid cutaneous papillomatosis, ichthyosis acquisita (acquired hypertrichosis lanuginosa), Cowden syndrome, tylosis, acrokeratosis paraneoplastica of Bazex or tripe palms accompany the sign of Leser–Trélat.
Additionally, a condition known as acanthosis nigricans is present in affected individuals. In acanthosis nigricans, patches of skin darken and thicken to gain a velvet-like appearance. Gender specific features also include enlarged clitoris and breasts, as well as ovarian cysts in affected females, and enlarged penis in affected males. [3]