Types of Frostbite 

Frostbite is typified in terms of degrees.

•    First degree frostbite is actually called frostnip.  In this situation only the outer skin is frozen. Usually there is no permanent damage.

•    Second degree frostbite also has frozen skin but it actually hardens and will form blisters. While the area will heal it may develop an insensitivity to temperature.

•    Third and Fourth degree frostbite dives deep into the body.  In this case nerves, tendons, muscles, and blood vessels actually freeze. Nerve damage can occur and in very extreme cases amputation may be required.