What injury results from prolonged exposure of the skin to wet conditions?

Prolonged exposure of the skin to wet conditions can lead to trench foot, a condition that arises when feet are submerged in water or exposed to excessive moisture for extended periods, particularly in cold environments. The skin becomes saturated, leading to damage to the tissues and blood vessels. People who experience trench foot may encounter symptoms such as swelling, pain, numbness, and discoloration of the skin. This condition often affects individuals in environments where they have to traverse waterlogged spaces, such as military personnel in trenches during World War I, from which the term "trench foot" originates.

Chilblain is typically caused by exposure to cold and wet conditions but does not require prolonged wetness. Frostbite occurs due to freezing temperatures affecting skin and underlying tissues, while heat cramps are muscle spasms that occur in hot environments due to sweating and loss of electrolytes. Therefore, trench foot is the only option specifically linked to skin injury from extended wet exposure.