What are frost bites?

 
Frost bite is death of tissue caused by exposure to cold. Upon exposure to cold, the initial reaction of the body is to increase blood flow to that area in order to keep it warm. Upon prolonged exposure to cold, the body tries to conserve heat for the vital organs by decreasing blood flow to the hands and legs. This can cause death of the tissue and is known as frost bite. In the initial stages, frost bite can be reversed by gradual warming of the affected parts. The body may then be able to revive or replace the dead tissue. In the more severe stages of frost bite, the tissue cannot be saved and amputation of the fingers, toes or even the arm or leg may be required to save the life of the patient.