<prompt> Acanthosis nigricans is seen in ?DiabetesGIT cancerHypothyroidismAll of the above  <response>: Ans. is d i.e., All of the above Acanthosis nigricans Acanthosis nigricans is a brown to black, velvety hyperpigmentation of the skin. It is usually found in body folds, such as posterior lateral folds of neck, axilla, groin, umblicus, forehead. It typically occurs in individuals younger than 40 years of age. Histopathologically papillomatosis is characteristically seen; however, there is no hypermelanosis and there is only mild acanthosis, if present. It is associated with Obesity most common Endocrinopathies -- Hypothyroidism, hypehyroidism, insuline resistance diabetes, Cushings disease, PCOD, Bloom syndrome. Internal malignancy -- Gastric adenocarcinoma 