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Is your leg, from the knee down, black and blue in color or is it blue?
If it is bruising or black and blue following surgery, this is postoperative blood that will resolve and nothing to worry about.
However, if your leg is blue in color, please call your surgeon immediately. This indicate peripheral cyanosis, Peripheral cyanosis results from decreased local blood circulation in the peripheral organs, arms and legs. This is commonly seen if the arterial blood stagnates too long in the limbs and loses most of its oxygen.