Raynaud’s disease is a condition that causes some areas of your body to feel numb and cool in response to cold temperatures or stress.  This is caused by narrowing of the small arteries that supply blood to your skin, limiting blood circulation.  When exposed to cold temperature the blood supply is markedly reduced and the skin turns pale or white and becomes cold and numb.  When the oxygen supply is depleted, the skin color turns blue, something that is known as cyanosis.