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Blue fingernails are caused by a lack or low level of circulating oxygen in your red blood cells. This condition is known as cyanosis. It occurs when there isn't enough oxygen in your blood and the skin or membrane below the skin turns a purplish-blue color.
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YESSOMEWHATNO
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You are exposed to cold in winter and it is normal to get blue color in winters. YOu can prevent it by wearing cotton gloves
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YESSOMEWHATNO
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