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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.
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]
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.
Cushing's syndrome Acanthosis nigricans associated with obesity, insulin-resistant states, and endocrinopathy; Excess ovarian androgen release syndrome (ovarian SAHA syndrome) Familial acanthosis nigricans (acanthosis nigricans type II) Growth hormone deficiency; Hyperandrogenism–insulin resistance–acanthosis nigricans syndrome (HAIR-AN ...
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]
Acanthosis nigricans—hyperpigmentation of intertriginous areas associated with insulin resistance. Melasma, also known as 'chloasma' or the “mask of pregnancy,” when it occurs in pregnant women.— It is a common skin problem that causes dark discolored patchy hyperpigmentation.
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.