It is unscientific for northern residents, especially rural residents, to keep warm in winter. Exposing hands and feet for a long time in winter causes blood vessels to contract and blood flow to decrease. At this time, if it is baked with fire immediately, the blood vessels will be paralyzed, lose their contractility, and there will be arterial congestion, telangiectasia, enhanced permeability and local congestion. Mild frostbite, severe tissue necrosis. Therefore, frozen hands and feet can only be gently rubbed to make them slowly return to normal temperature. Most residents in the north know that frozen hands can't be washed with hot water, and they can only be eased by rubbing them slowly with snow water, otherwise skin necrosis will easily occur.

2. Touching the skin with your hands is itchy.

In winter, due to indoor and outdoor dryness, I often feel itchy all over. Many people instinctively grasp with their hands, which is not right. Never scratch your skin when it is dry and itchy, otherwise it will easily scratch your skin and cause secondary infection. The prevention method is to drink more water, eat more fresh vegetables and fruits, eat less spicy food such as hot and sour, and drink less. Take a bath frequently and change your underwear frequently. Those with severe itching can take chlorpheniramine, phenamine and other drugs, or apply calamine lotion or soothing ointment for treatment.