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Acanthosis Nigricans may be defined as a general pigmentation with papillary mole-like growths. In the "International Atlas of Rare Skin Diseases" there are two cases pictured, one by Politzer in a woman of sixty-two, and the other by Janovsky in a man of forty-two. The regions affected were mostly of a dirty-brown color, but in patches of a bluish-gray.
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