Frostbite and frostnip are both cold-related injuries that occur when skin and underlying tissues are exposed to freezing temperatures, but they differ in severity. Frostnip is a mild form of cold injury where the skin turns pale or red, feels cold, and may tingle or burn. It can usually be treated by gently warming the affected area, and there is no permanent damage. Frostbite, on the other hand, is more serious and occurs when the skin and deeper tissues freeze, causing permanent damage to the affected areas. Symptoms include numbness, a hard or waxy feel to the skin, and blisters. Frostbite requires immediate medical attention, and rewarming should only be done under medical supervision to avoid further damage. Preventing both involves dressing in layers, covering exposed skin, and avoiding prolonged exposure to extreme cold.