The plaster usually needs to be applied for about half an hour, but because different plasters contain different drug ingredients and different drug irritation, the time of application should not be too long, and the skin to be applied should be observed for redness, swelling, swelling, pain or some other symptoms, if the symptoms of allergy appear, the plaster needs to be removed in time to avoid causing skin breakdown or pain aggravation. In case of allergy, avoid contact with similar irritants and brake the joint to avoid aggravation of pain. If the joints are red and swollen, avoid applying hot compresses, and apply cold compresses appropriately to reduce the pain of the joints. Generally creams do not produce much side effects and do not cause dizziness, nausea or vomiting, unless they contain strong irritants to cause symptoms.