Vessels contract: Cold causes all blood vessels to constrict, and blood flow is reduced to extremities. When it is cold, lips and fingers do take on less of the red blood component and therefore look more "blue".
Answered 2/13/2016
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2 doctors weighed in across 2 answers
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A doctor has provided 1 answer
2 doctors weighed in across 2 answers
A doctor has provided 1 answer
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