Dryness of the whole body with itching discomfort may be related to pruritus, eczema, psoriasis and other diseases. 1. Pruritus: associated with dry skin, mental factors, environmental factors, combined with underlying diseases, etc., is a kind of dermatological symptoms only itchy skin without primary skin damage, can appear dry skin, itching 2. Eczema: a chronic recurrent skin disease formed due to the stimulation of some internal and external factors, clinically manifested as recurrent itchy rashes, moss-like changes and dry peeling symptoms can also occur. 3. Psoriasis: related to heredity and autoimmunity, it is a kind of chronic inflammatory disease, which is mainly manifested by scaly rash and itching, and dry and flaky skin. Due to the complexity of the cause, the specific situation needs to be consulted by a doctor.