Herpes zoster can be applied with hot water at some stage of treatment, and hot water is not advocated when there are blisters in the early stage. The details are as follows: 1. After the blisters are compressed with hot water, the trauma can enter the water and complicate the bacterial infection, and after the hot water compress, the trauma is not easily crusted and the course of the disease is prolonged; 2. After the rash has healed, heat therapy is also a better treatment. If the patient has neuralgia, the heat can relieve the neuralgia, just like in the treatment of herpes zoster neuralgia or post-herpetic neuralgia, ultra-short wave, microwave, including the former Zhou Lin spectrum therapy instrument, are through the way of heat therapy, not to increase blood circulation, relieve pain, the release of inflammatory mediators, to achieve the purpose of relieving pain. Patients with rashes close to all healing, no trauma, you can use hot water compresses, but pay attention to the time of compresses, the temperature is about 40 ℃, high hot water compresses can cause burns.