What are the three stages of frostbite and how can they be identified and treated effectively?

Frostbite has three stages: frostnip, superficial frostbite, and deep frostbite. Frostnip is the mildest stage, characterized by numbness and tingling. Superficial frostbite involves skin turning white or pale, followed by redness and swelling. Deep frostbite affects deeper tissues and can cause numbness, stiffness, and blisters. To treat frostbite effectively, it is important to gradually warm the affected area, avoid rubbing or massaging it, and seek medical attention if necessary.