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Chilblains (/ËtÊÉªlbleÉªnz/) â also known as pernio, Chill Burns and perniosis â is a medical condition that occurs when a predisposed individual is exposed to cold and humidity, causing tissue damage. It is often confused with frostbite and trench foot.
What is the cause of chilblains? Chilblains occur several hours after exposure to the cold. Cold causes constriction of the small arteries and veins in the skin. The chilblains are sometimes aggravated by sun exposure, because rewarming results in leakage of blood into the tissues and swelling of the skin.