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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.
Given that chilblains are caused by exposure to cold conditions, it may not surprise you to know that the first element of this word comes from the noun chill.. The second element, blain, may be less familiar, though the word blain (an inflammatory swelling or sore) is still used by English speakers.