Acanthosis nigricans: It is a brown to black, poorly defined, velvety hyperpigmentation of the skin usually present in the posterior and lateral folds of the neck, the axilla, groin, umbilicus and other areas. More detailed information about the symptoms, causes, and treatments of Acanthosis nigricans is available below.
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A circumscribed melanosis consisting of a brown-pigmented, velvety verrucosity or fine papillomatosis appearing in the axillae and other body folds. It occurs in association with endocrine disorders, underlying malignancy, administration of certain drugs, or as in inherited disorder. - (Source - Diseases Database)
A skin disease characterized by dark wart-like patches in the body folds; can be benign or malignant - (Source - WordNet 2.1)
Acanthosis nigricans is listed as a "rare disease" by the Office of
Rare Diseases (ORD) of the National Institutes of Health
(NIH). This means that Acanthosis nigricans, or a subtype of Acanthosis nigricans,
affects less than 200,000 people in the US population.
Source - National Institutes of Health (NIH)
Ophanet, a consortium of European partners,
currently defines a condition rare when it affects 1 person per 2,000.
They list Acanthosis nigricans as a "rare disease".
Source - Orphanet
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