What causes noses to turn blue?

Answer

Discoloration of the nose may be caused by hayfever, respiratory infection, poor circulation or exposure to cold. What all of these causes have in common is a disruption to the nose's supply of oxygen.

The hemoglobin in blood is what lends skin its normal, warm color. When blood vessels constrict due to low temperature or poor circulation, or when oxygen is at a premium due to difficulty breathing, parts of the body turn pale and then blue. This is because the oxygen-carrying hemoglobin is not getting to the area. Blue coloration may also be caused by bruising of the nose due to bleeding under the skin. One unique cause of blue nose is Raynaud's, a disorder that is characterized by sudden attacks of vasospasm, a narrowing of the blood vessels.

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