Itchy skin in winter need to be vigilant elderly pruritus, atopic dermatitis, urticaria, contact dermatitis, bile duct obstruction, diabetes and other diseases. 1. Pruritus in the elderly. When there is intense itching of the skin, scratching caused by scratches, scabs, skin thickening, mossy changes and other features of the rash, you should be vigilant about pruritus in the elderly. 2. Allergic dermatitis. Itchy skin may also be related to skin allergies, such as food, drug allergies may appear localized itchy skin symptoms. 3. Urticaria. When there is a clear localized wind, itching in the wind to aggravate the main symptoms, need to be alert to the possibility of urticaria. 4. Contact dermatitis. When the symptoms of itchy skin appear in winter, we also need to be alert to the possibility of contact dermatitis. Contact dermatitis refers to the skin mucous membrane contact with some external pathogenic substances caused by acute inflammatory reaction of the skin disease. 5. Biliary tract obstruction disease. When the symptoms of itchy skin appear in winter, and when the symptoms of jaundice such as yellowing of the skin and mucous membranes and yellowing of the urine appear, the possibility of biliary tract obstructive diseases should also be alerted. 6. Diabetes. When middle-aged and elderly people experience itchy skin in winter, they need to be alert to the possibility of diabetes. Abnormal blood sugar levels can affect the excretion of toxins, and itchy skin can also occur. Itchy skin in winter may also have other causes, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, to give targeted treatment or treatment.