Hot water bag on the buttocks may cause burns. Hot water bag on the buttocks, if the hot water bag temperature is too high, there is no effective isolation, or the buttocks and hot water bag contact time is too long, may cause scalding of the buttocks skin, resulting in redness and swelling of the skin or the emergence of blisters, or even the formation of skin vesicles and ulcers and other symptoms. When using a hot water bag, be sure to pay attention to the control of temperature, if the temperature is high, you can isolate it through a towel and other items, and regularly move the hot part and observe the skin condition, especially for the elderly, infants and young children, and patients with sensory impairment, such as spinal cord injury, stroke. If the hot water bag burns the buttocks, the skin should be kept clean and hygienic, and can be routinely sterilized, and if necessary, the use of topical medications for symptomatic treatment or anti-infective treatment. Specific treatment should be carried out under the guidance of a doctor.