The reason for the pain instead of plastering is mainly three: First, after the appearance of injury or aseptic inflammatory lesions, often experience 3-5 days of edema period, this process gradually increased edema, therefore, after plastering, although there is a certain therapeutic effect, but edema period still need to spend, is gradually appearing pain sensation. Second, due to local trauma, resulting in skin rupture, after the plaster may lead to inflammatory exudate in the wound, as well as pollutants can not be effectively discharged, will lead to the gradual formation of local infection lesions, will stimulate the peripheral nerves around, there will be obvious pain sensation. Third, because of the strong allergic reaction after the plastering, resulting in skin redness, inflammatory edema, will lead to peripheral nerve stimulation, there will also be pain sensation.