Itchy and dry skin is not necessarily a lack of anything, but may be related to chronic eczema, contact dermatitis, ringworm and other diseases. 1. Chronic eczema: is due to the local skin long-term stimulation by a variety of internal and external factors, and the formation of a chronic inflammatory skin diseases, in the clinic can be manifested as thickening of the skin, dry peeling and accompanied by itching and so on. 2. contact dermatitis: is due to the local skin due to contact with some kind of irritating goods and the occurrence of perverse reaction, acute phase may be mainly exudation, repeated onset of local skin may form moss-like changes, even scales, manifested as a relatively dry. 3. Ringworm: a skin disease caused by skin infection with ringworm bacteria, usually manifested as clearly defined lesions, accompanied by varying degrees of itching and surface dryness, peeling. If the itchy and dry skin symptoms persist, it is important to consult a doctor in time.