Generally speaking, most plasters can be applied for 1-3 days in a row. After reaching the time of use, patients can remove the plaster and replace it with a new one. In clinical practice, the usage of such plasters is used for thinner plasters, like Yunnan Baiyao plaster, wound and dampness pain relief plaster, and blood circulation pain relief plaster. There are a few black plasters that can be used continuously for more than 1 week. These black plasters are characterized by a black sticky drug in the center of a cloth, which needs to be baked with fire before use, and then applied to the affected area, and then removed after about 3 days of use, and then baked with fire and applied again, which can be reversed 2-3 times. In clinical use, patients can refer to the following criteria: 1. patients can refer to the use criteria on the manual. 2. patients can follow the doctor’s instructions. 3. for some special parts, patients can ask the doctor to change the plaster, because some plasters also have a corresponding protective effect on the limbs during the treatment of patients, such as the dislocation of interphalangeal joints. When the interphalangeal joint is dislocated, you can use the plaster to wrap around the reset interphalangeal joint, which not only plays the role of blood circulation and blood stasis, but also has a certain fixed effect, so you should ask the doctor to operate when replacing it.