Always itchy body may be caused by pruritus, eczema, scabies or contact dermatitis. 1. Pruritus: dry skin, allergies are related to the elderly or bathe too often people are prone to appear, more common in winter. It is often seen in winter. It is manifested as no obvious rash on the body but obvious itching, mostly accompanied by dry and flaky skin. 2. Eczema: a variety of internal and external factors caused by intense itching of a skin inflammatory reaction, the etiology is not clear, may be related to genetic factors, immune abnormalities and other factors, manifested as a symmetrical body erythema, pimples, or flaking, itching is obvious. 3. Scabies: It is a skin disease caused by scabies mite infection through skin contact, and it occurs in the thin and tender skin or folded parts such as finger cracks, armpits, groin or male vulva. It is characterized by the appearance of pinpoint-sized bumps on the body, accompanied by itching, which is obviously aggravated at night. 4. Contact dermatitis: caused by skin contact with certain allergens, such as plasters, metal jewelry. The performance of the skin and contact with the shape of the same red spots, itching obvious. Always itchy body may have other reasons, it is recommended to go to the hospital in a timely manner to clarify the cause of the disease, follow the doctor’s instructions standardized treatment.