What is a common sign of immersion syndrome, also known as trench foot?

A common sign of immersion syndrome, or trench foot, is indeed characterized by redness and swelling of the skin. This condition occurs when the feet are exposed to wet and cold conditions for an extended period, typically while in wet, muddy, or poorly insulated environments. The prolonged exposure to moisture leads to skin and soft tissue damage, which manifests as inflammation, redness, and swelling.

This skin reaction signifies that the body's normal physiological responses are being affected by the cold and wet conditions. In contrast to other choices, persistent fever and dehydration are not typical signs directly associated with trench foot. Severe pain in extremities can occur as the condition progresses, but early signs are primarily focused on the visible changes in the skin, such as redness and swelling. Recognizing these early symptoms is crucial for prompt treatment and to prevent further complications associated with trench foot.