Frostbite and frostnip
1. Frostbitten body parts are white and hard or waxy. They may be white-purple or white-yellow.
2. Frostnipped parts are white but not hard and are generally very small areas.
3. Frozen parts have no feeling.
4. During the freezing process, they may tingle or feel like a block of wood.
5. Once frostbitten areas thaw, they may be painless or tingle.
6. When they are rapidly rewarmed in warm water by the recommended method, they may be painful.
7. Over the next few days, the part is often painful and swollen.
8. Blisters may appear, and severely affected areas turn black.

Immersion injury
1. Areas affected by immersion injury are first red and then turn pale and swollen.
2. Numbness or painful tingling may occur.
3. After the first few days, the part becomes very red, tingling, swollen, and may have blisters, skin breakdown, or even liquefy.

Pernio
1. Pernio is a rash on the lower legs, feet, toes, hands, or ears that may be red or blue and may form scaly areas or lumps.
2. Rarely, affected parts may bleed, blister, or have skin breakdown.
3. Raynaud's phenomenon refers to constriction of the blood vessels of the hands or feet in response to cold exposure. Raynaud's phenomenon causes white, then blue, then red-colored fingertips and toes and is often painful.
4. Cryoglobulins cause a wide array of symptoms, depending on whether or not internal organs are involved, including deep-blue fingertips.
5. Cold urticaria refers to raised red bumps or hives produced in response to cold exposure.