Frostbite is most common in children, women and people with poor peripheral circulation. It occurs on the back of the fingers and hands, toes and heels, cheeks, earlobes and other extremities, and is slow to develop in winter and heals itself when the weather warms up. Although it is not a major disease, the pain and itching is very uncomfortable. The skin breaks down after scratching with hands, which can easily lead to secondary infection. A particular headache is that frostbite is difficult to cure and recurs year after year. Therefore, even though frostbite is small, it should be taken seriously. Besides the cold, what factors are likely to cause frostbite recurrence? The first is age: children and teenagers are prone to frostbite, while young adults and the elderly rarely experience it. This is because under the stimulation of cold, the subcutaneous blood vessels of children and teenagers are prone to spasmodic contraction, blood stagnation, local tissue malnutrition, and injury. The second is physical condition: people with weak constitution, heart disease, vascular disease and poor peripheral blood circulation function have poor local skin tolerance to cold and are prone to frostbite. The third is the environment. Under humid conditions, the effects and hazards of cold are significantly aggravated, and the contraction and diastole functions of the human local blood vessels are more easily destroyed, making frostbite easy to form. Finally, lack of activity, narrow clothing, malnutrition and excessive fatigue are also prone to frostbite. To reduce the occurrence of frostbite, it is best to do a good job of prevention before winter. The specific method: after waking up in the morning and taking a lunch break, wash your face with cold water to improve facial blood circulation, which is also an exercise for people’s cold tolerance and has a great effect on frostbite prevention. You can also use the gap between washing your hands, face and feet every day to gently rub the skin until it is slightly hot to promote blood circulation. Attention should also be paid to local warmth, and shoes should be worn warmly, but not too tightly. Also strengthen physical exercise, such as dancing and rope skipping. Local massage is the best way to prevent frostbite: do more hand massage, foot massage and ear massage. If frostbite has already occurred, you can apply topical medications that promote blood circulation such as camphor ointment or chili tincture, topical antibiotic ointment for ruptures, and red light or helium-neon laser physical therapy. Take internal peripheral circulation dilators such as niacin and nifedipine.