Chilblains are inflammation of blood vessels in your skin that is in response to exposure to cold. Chilblains mostly appear red, itchy, swollen, blistering fingertips and toes. Chilblains usually takes 2-3 weeks to get better. Rewarming hands or feet can alleviate symptoms of chilblains. To prevent chilblains dress in layers, limit exposure to cold and keep hands, feet and face dry and warm.
Source: https://www.mayoclinic.org/diseases-conditions/chilblains/symptoms-causes/syc-20351097
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