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Acanthosis nigricans
A skin condition characterised by dark, velvety patches in body folds and creases.
Acanthosis nigricans typically occurs in people who are obese or have diabetes. More rarely, it can be a warning sign of a cancerous tumour in an internal organ, such as the stomach or liver.
Dark, velvety patches of skin often appear in the armpits, groin and neck.
Treating underlying conditions, such as obesity or a tumour, may restore the skin.