reddened hand showing frostbite symptoms against white background

frostbite hand skin reddened swollen cold exposure injury medical healthcare health winter damage tissue inflammation pain numbness white background closeup detail clinical dermatology emergency medicine aid treatment symptom sign diagnosis patient care doctor hospital room hypothermia frozen icy weather season condition dermatological red texture rough dry problem body human anatomy physiology education training reference research redness roughness dryness lesion blisters itching discomfort sensitivity freezing chill vascular peripheral circulation blood vessels