Itchy back after the bath may be due to dry weather caused by the normal phenomenon, there may also be due to contact dermatitis, there may be due to hives. 1. Physiological factors: dry weather, coupled with bathing can be the body surface of the sebaceous layer washed away, so that the skin surface of the water is more likely to evaporate, which can lead to dry skin and then appear back itchy performance, in the normal phenomenon, only need to use moisturizing milk after bathing can be relieved. 2. Contact dermatitis: the skin will come into contact with the shower gel and other chemicals when bathing, so the contact area and the skin outside the contact area can occur contact dermatitis, back itchy symptoms, treatment can be used glycerine lotion, dexamethasone ointment, but also to take drugs such as Benadryl for treatment. 3. urticaria: urticaria is a skin mucous membrane small blood vessels temporarily dilated, increased permeability, local edema disease, in the bath skin heat can appear after the skin local wind, resulting in back itchy symptoms, treatment can use loratadine, glycerine lotion and other drugs for treatment. Excluding physiological factors, if the symptoms of itchy back continue to be unrelieved after taking a bath, it is recommended to consult a doctor in time to find out the cause and ask the doctor to deal with it. The medication should be used according to the doctor’s prescription.