Dry and cracked skin, may be caused by physiological factors as well as pathological factors, pathological factors may include psoriasis, common ichthyosis, exfoliative dermatitis and other diseases. 1. Physiological factors: in winter, the weather is dry and cold, if you do not pay attention to local moisturizing, especially for dry skin, sebum secretion of the population, there will be dry skin peeling, this time you need to pay attention to local moisturizing. 2. Psoriasis: It is induced by both genetic and environmental factors, leading to immune response of the skin, mostly aggravated in winter, the skin may appear papules or maculopapules, and there are scales appearing, accompanied by itching at the same time. 3. Ordinary type ichthyosis: also known as dry skin disease, is an autosomal dominant disease, dry skin, no sweat or less sweat, mild symptoms of only dry skin, the surface can have scales, typical performance for brown polymorphic keratin scales, edge of the upturned, the center of the solid like fish scales. 4. Exfoliative dermatitis: can be secondary to certain skin diseases such as psoriasis, contact dermatitis, etc., but also for leukemia, lymphoma and other diseases of the skin manifestations, the skin can be bright red and dry, as well as scales appear, and can be gradually shed and gradually generated. Skin with dry cracked skin, in addition to pay attention to moisturizing, it is also recommended to consult a doctor in a timely manner, after identifying the cause of the disease, in accordance with the doctor’s instructions on the cause of the symptomatic treatment.