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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.
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 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]
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.
Lelis syndrome is a genetic disorder, a rare condition with dermatological and dental findings [1] characterized by the association of ectodermal dysplasia (hypotrichosis and hypohidrosis) with acanthosis nigricans.
Examples of intertriginous areas are the axilla of the arm, the anogenital region, skin folds of the breasts and between digits. Intertriginous areas are known to harbor large amounts of aerobic cocci and aerobic coryneform bacteria, which are both parts of normal skin flora.
Malignant acanthosis nigricans may also become evident, many times with the sudden eruption of multiple seborrheic keratoses, known as the sign of Leser-Trélat. [ 9 ] [ 10 ] [ 11 ] Florid cutaneous papillomatosis mandates a search for an underlying malignancy, recognizing that it may be seen in patients with multiple visceral carcinomas.
Obesity is the chief symptom of HAIR-AN. [4] In the majority of young women affected by HAIR-AN, hyperandrogenism leads to oily skin, acne, hirsutism, menstrual irregularities and, in some cases, androgenic alopecia, clitoromegaly, changes in muscle mass and deepening of the voice.