Acanthosis nigricans (AN) describes clinically hyperpigmented skin, which most commonly affects the flexural areas such as axilla, groin and neck. It is usually a benign condition associated with obesity, insulin resistance, and hyperinsulinemia; endocrinopathy; or malignancy, in particular, gastrointestinal adenocarcinoma. It can also occur in association with various genetic syndromes involving various organ systems. Few such known syndromes are Berardinelli-Seip syndrome, Alström syndrome, Leprechaunism, and Bardet-Biedl syndrome. MORFAN syndrome, which associates mild mental retardation, pre- and post-natal overgrowth, remarkable facies and diffuse and widespread AN, is a rare entity.
Keywords: Acanthosis nigricans; MORFAN syndrome; pre and post-natal overgrowth.