Ear frostbite is bilaterally distributed, with cool terminal skin of the ear, along with excessive sweating. The most common lesion is a limited, petechial, dark purplish-red, elevated, edematous erythema with indistinct boundaries and bright red margins. The surface is tense and shiny, soft in texture, and can be discolored by local pressure, with the red color gradually returning after pressure is removed. Pruritus is obvious and intensifies with heat. If frostbite is prolonged, local tissue hypoxia and cell damage are severe, blistering may occur on the damage surface to form a vesicular surface or ulcerated surface, leaving pigmentation or atrophic scar after healing.