Blackened hands in winter may be caused by cold hands, improper hand care, poor peripheral circulation and other factors. 1. Cold hands: When the environmental temperature is relatively low in winter and no warming measures are taken, the hand tissues are cooled and the symptoms of black hands may appear. 2. Improper hand care: winter weather is dry, hand skin will appear dry and hyperpigmentation symptoms, if there is no good moisturizing and care work, may lead to hand black. 3. Poor peripheral circulation: cardiopulmonary diseases, vascular diseases, may lead to poor peripheral circulation of the fingers, patients may appear black hand symptoms. There are many factors that lead to blackening of the hands in winter, it is recommended to go to the hospital in time to identify the cause of the relevant treatment, and strictly comply with the doctor’s instructions for medication.