Frostbite can occur in freezing temperatures when your blood vessels narrow, skin temperature drops and ice crystals form around and within your cells, causing damage.
"There's a continuum of cold-related skin injury. The first is called 'frostnip,' and that is a cooling of the outermost skin tissue without any actual destruction to the tissue. You know this is happening because the skin can become discolored, sometimes bright red, and can look irritated and feel extra sensitive, and that's a good warning sign that the skin is getting too cold," Caldwell said.
"Then, frostbite involves actual skin destruction, and frostbitten skin usually appears pale, waxy, and can sometimes turn even purple or black as the tissue begins to die. Frostbitten skin can be numb or painless," he said.
Frostbite can even occur in your eyes, Salamon said. "When you're out in the cold windy weather, you can actually get frostbite of your eyes, which is really dangerous," Salamon said.
"The cold starts to form little blisters in your eye or little crystals on your skin, which can turn around and damage the skin or the eye itself," she said. "Those blood vessels really get very constricted, so there's not much blood going through it, which cuts down on the circulation of the eyes."
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