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From Wikipedia:

Trench foot, also known as fat foot, is a medical condition caused by prolonged exposure of the feet to damp, unsanitary and cold conditions.

Affected feet may become numb, may be affected by erythrosis (turning red) or cyanosis (turning blue) as a result of poor vascular supply, and feet may begin to have a decaying odor due to the possiblility of early stages of necrosis. As the condition worsens, feet may also begin to swell. Advanced immersion foot often involves blisters and open sores, which lead to fungal infections; this is sometimes called tropical ulcer (jungle rot).

If left untreated, immersion foot usually results in gangrene, which can require amputation. If treated properly, complete recovery is normal, though it is marked by severe short-term pain when feeling returns. Like other cold injuries, it leaves sufferers more susceptible to it in the future.
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15y ago

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