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Eventually, dark, velvety skin with very visible markings and creases appears in the armpits, groin, and neck. Sometimes, the lips, palms, soles of feet, or other areas may be affected.
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Hyperpigmentation is the increase in the natural color of the skin.
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Cyanosis is a bluish color to the skin or mucus membranes due to a lack of oxygen in the blood.
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