Carrying out the topical application of ointment treatment, the replacement time of each paste of ointment should be decided according to the specific instructions of the ointment. But in the clinic the general replacement time is 24-48 hours, but the specific must be used according to the instructions of the drug, or under the guidance of the physician. There are several precautions for plaster treatment: 1, if the skin is broken, that is, the skin has abrasions, contusions, or even cracks, bleeding, must not use drugs externally, otherwise it is easy to cause secondary infection at the skin injury.2, plaster treatment sometimes produces an allergic reaction, localized itching as well as rashes, in this case, we must stop the external use of drugs, allergy supportive symptomatic treatment.3, In the acute stage of the injury, it is not recommended to immediately carry out the plaster treatment, you can wait for the local swelling and pain slightly relieved, usually 3-5 days later before using the plaster treatment.