Which of the following is a sign of superficial frostbite?

A sign of superficial frostbite is characterized by a change in skin color, typically appearing as white or grayish-yellow. This change occurs due to the freezing of the skin and underlying tissues, leading to reduced blood flow in the affected area. In the case of superficial frostbite, the skin may still be soft and may not exhibit severe damage initially, but the discoloration is a key indicator that the tissue is impacted by cold exposure.

Other manifestations, such as blisters and swelling, are more indicative of deeper frostbite rather than superficial involvement. Extensive tissue loss and blackened skin are signs of more severe frostbite conditions that affect deeper layers of tissue and require immediate medical attention.