Acanthosis nigricans associated with malignancy
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Acanthosis nigricans associated with malignancy (also known as "Acanthosis nigricans type I") is the "malignant" type of acanthosis nigricans
Acanthosis nigricans
Acanthosis nigricans is a brown to black, poorly defined, velvety hyperpigmentation of the skin. It is usually found in body folds, such as the posterior and lateral folds of the neck, the axilla, groin, umbilicus, forehead, and other areas.-Causes:...

 that may either precede (18%), accompany (60%), or follow (22%) the onset of an internal cancer. Malignancy-associated acanthosis nigricans is usually rapid in onset and may be accompanied by skin tags, multiple seborrheic keratoses, or tripe palms.
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