The cyanosis - A bluish coloration of the skin or mucous membranes caused by an abnormally high level of deoxygenated haemoglobin in the blood. Cyanosis confined to the hands and feet is not serious; it is usually due to slow blood flow, often as a result of exposure to cold.

A blue tinge to the lips and tongue, however, could be caused by a serious heart or lung disorder such as chronic obstructive pulmonary disease or heart failure.


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