Ointment is a commonly used topical medicine, and its correct application includes choosing the right ointment, choosing the right location, skin cleansing, and precautions. 1. Choose the right plaster: different plasters have different indications and pharmacological effects, patients need to choose the right medicine according to their symptoms. 2. Choose the right location: plasters are usually put on the painful, red and swollen places of the skin, avoiding to be put on the wound erosion place, hairy place, and can’t be put on the place which is too close to the head and face, especially to the eyes, mouth and nose. 3. Pay attention to skin cleanliness: clean the affected skin before applying the ointment, and wait until it is dry before applying it. 4. Precautions: If there is obvious itching, redness and swelling after applying the plaster, it means that the skin is allergic to the plaster and should stop using it immediately. If the patient has the need to apply the ointment, he should go to the hospital, and be diagnosed by the physician, and then use it under the guidance of the physician or pharmacist. Do not use your own medicine, so as not to cause damage to your health.