The difference between cold and hot poultices is mainly reflected in the following aspects: 1. Directly related to the disease being treated. For new injuries, because there may be internal bleeding or sterile inflammation, cold compresses should be used as early as possible to maximize relief. For old injuries, or those with stagnant blood stasis, hot compresses should be used. The difference between the topical application and the medicinal properties is directly related to the medicinal properties, for example, some creams containing musk, ice chips and so on, need to use cold compresses. The difference in topical application is also related to the dosage form. Some of the creams made into powder or paste, use cold compresses. The more viscous plasters need to be applied with heat. In this case, you need to use the fire to bake this kind of plaster, and then put it to the appropriate temperature and then paste it to the affected area.