Merck Manual

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Acanthosis Nigricans in Polycystic Ovary Syndrome
Acanthosis Nigricans in Polycystic Ovary Syndrome
Acanthosis Nigricans in Polycystic Ovary Syndrome

In people with polycystic ovary syndrome, skin in the armpits, on the nape of the neck, and in skinfolds may become dark and thick (a disorder called acanthosis nigricans). In dark-skinned people, the skin may have a leathery appearance (bottom photo).

Images provided by Thomas Habif, MD.