Dry and itchy skin may be a symptom of eczema, pruritus or ichthyosis, and you should consult a doctor to find out the cause. 1. Eczema: Eczema is associated with a variety of internal and external factors related to allergies, hormonal changes in the body, heredity, immune dysfunction and so on. It can lead to dry, itchy, erythematous, papular and other polymorphic rashes on the skin. 2. Pruritus: Pruritus is mostly caused by dry skin, but also related to mental stress, anxiety, etc. Some chronic diseases such as diabetes, kidney disease may also cause pruritus. 3. Ichthyosis: It is an autosomal dominant disease, which can be manifested as dry skin with polygonal scales on the surface. Generally there are no conscious symptoms, some can be accompanied by itching. Body dry itching should go to the hospital in a timely manner, a clear diagnosis, under the guidance of the doctor treatment.