Overview

Frostbite is an injury caused by freezing of the skin and underlying tissues. In the earliest stage of frostbite, known as frostnip, there is no permanent damage to skin. Symptoms include cold skin and a prickling feeling, followed by numbness and inflamed or discolored skin. As frostbite worsens, skin may become hard or waxy-looking.

Exposed skin in cold, windy weather is most vulnerable to frostbite, but it can affect skin covered by gloves or other clothing. You may not realize you have frostbite until someone else points it out.

You can treat frostnip by rewarming. All other frostbite requires medical attention because it can permanently damage skin, muscle, bone and other tissue.