Which of the following is a common sign of frostbite?

Frostbite is a medical condition that occurs when skin and other tissues freeze due to extreme cold exposure. A common sign of frostbite is the development of blisters and swelling in the affected areas. This happens as the tissue is damaged, leading to inflammation and fluid accumulation, which causes blisters to form. The presence of blisters indicates a more severe injury resulting from the freezing process.

In contrast, healthy skin that is functioning normally would maintain a normal color and good sensation, which does not align with frostbite symptoms. Similarly, while frostbitten areas may appear red in an initial stage, they typically lose color and sensation as the condition progresses, rather than being red and hypersensitive. Finally, the texture of tissues affected by frostbite is usually hard and cold, not moist or supple, as the freezing process disrupts normal tissue hydration and structure. Thus, the presence of blisters and swelling is a key indicator of frostbite severity.