You have the condition known as acrocyanosis if your fingers, toes, wrists, hands, or feet look blue. The bluish tinge comes from the sudden spasm of tiny arteries that carry blood in the skin of your hands and feet, causing these parts to get less blood. As blood gives up more oxygen, the red pigment of the remaining red blood cells turns bluish-purple. This gives the skin its abnormal color.
Nobody knows why acrocyanosis develops.
The condition is intensified by cold. It is present to an equal degree in both hands or both feet. It is not painful, but the affected hands or feet nearly always feel cold and may be sweaty. Acrocyanosis does not cause ulceration or other skin problems. Do not be too concerned if you have acrocyanosis.