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}}Immersion foot or archaically trench foot is a medical condition caused by prolonged exposure of the feet to damp, unsanitary and cold conditions above freezing point.
Immersion foot occurs when feet are cold and damp while wearing constricting footwear. Unlike frostbite, immersion foot does not require freezing temperatures and can occur in temperatures up to 60┬░ Fahrenheit (about 16┬░ Celsius). The condition can occur with as little as twelve hours' exposure.
Affected feet become numb and then turn red or blue. As the condition worsens, they may swell. Advanced immersion foot often involves blisters and open sores, which lead to fungal infections; this is sometimes called jungle rot.
If left untreated, immersion foot usually results in gangrene, which can require amputation. If immersion foot is treated properl