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"Frostbite occurs when very cold"

Frostbite is caused by poor blood irrigation as well as blood circulation problems. They increase skin sensitivity to moisture and cold. Frostbite appears as blue knots under the skin that are often very sensitive and painful, and can come to a complete loss of sensation. Not occur in case of freeze, after prolonged exposure to cold conditions, but rather due to meteorological situations with wet and cold weather.
Facts from Health