The duration of plaster application is usually decided according to the type of plaster, and the specific time and way of application should follow the doctor’s instruction. For example, if the plaster is used to activate blood circulation and remove blood stasis, the duration of application is about 12 hours. If it plays the role of activating blood circulation and removing blood stasis (promoting blood circulation and eliminating blood stasis in the body), and is used for the treatment of blood stasis, muscle strain and other plasters, such as pain relieving plasters and Yunnan Baiyao plasters, etc., the efficacy of this type of plasters penetrates faster, and the general duration of the plastering is about 12 hours. If it is used for the treatment of osteoporosis, rheumatism and other diseases of chronic ointment, such as musk chasing the wind paste, blood circulation and pain relief paste, etc., this kind of ointment content is relatively high, the efficacy of the penetration of the slower, it generally takes about 1 day, the efficacy of the medicine to play a role completely. It is recommended that the skin be wiped clean before using the ointment so that it does not fall off. If symptoms of allergy occur during the period, stop plastering and seek medical attention.