Itchy back of hands may be caused by contact dermatitis, fungal infection, eczema and other reasons. 1. Contact dermatitis: if the skin is in contact with external substances and causes inflammatory skin disease, the back of the hands may appear itchy phenomenon. 2. Fungal infection: patients may also be due to the back of the hand localized dermatophytes or other pathogenic fungal infections caused by the inflammatory reaction, thus appearing back of the hand itchy symptoms. 3. Eczema: caused by a variety of internal and external factors, itching intense inflammatory skin reaction, the back of the hand oozing, crusting, itching and other symptoms, the patient if eczema, there will be the phenomenon of the back of the hand itchy. The back of the hand itchy cause may also be hives, mosquito bites and other causes, if the patient appeared back of the hand itchy situation and a long time does not relieve, should go to the regular hospital in a timely manner, for further examination, to identify the cause of the cause of the disease under the guidance of the doctor to actively treat.