There is nothing to show on the hand is itchy, consider pruritus, is a kind of skin disease only itchy skin without primary lesions, the cause of this disease is more complex. The cause of nothing on the hands is itchy special types of pruritus, including the following kinds. 1. senile pruritus: mostly due to sebaceous gland hypoplasia, sebum secretion reduction, dry skin and degenerative atrophy or excessive washing and scalding and other factors induced, can occur in the limbs and trunk. 2. Winter pruritus: induced by cold, mostly occurring in late fall and winter when the temperature changes sharply, by the cold outdoors suddenly indoors or at night when undressing and sleeping aggravated, often accompanied by dry skin. 3. Summer pruritis: often occurs in summer, high heat, humidity is obvious, sweating often make itching worse. 4. pregnancy pruritus: the incidence of pregnant women for the first time for 0.06% to 0.43%, the incidence of patients pregnant again up to 47%. 85% of patients is due to the increase in estrogen caused by intrahepatic cholestasis. When there is nothing on the hands is itchy, it is recommended that patients go to the dermatology department in a timely manner, under the guidance of the doctor standardized treatment.