The effect of corns patch is related to the severity of corns, the effect of using corns patch is more obvious for corns with mild symptoms, but recurring and serious symptoms of corns, the treatment effect of corns patch may not be ideal and need to apply physical therapy or surgical treatment. At the beginning of the formation of corns, the corneal layer is generally thickened. If no timely measures are taken, the corneal layer will gradually thicken and harden, and conical corneal plugs will appear under the corneal layer to penetrate deep into the skin. The main ingredient of corns patch is salicylic acid, which is strongly corrosive and can promote the elimination of corns. After soaking and cleaning the corneal area, softening the affected corneal layer and removing the hard skin on the surface, then applying the patch to the corneal area, most of the minor corneal will gradually fall off. If the condition of the corns worsens, causing strong pain or even bleeding or pus, you should not continue to use the patch at this time. You should ensure that the affected area is clean and dry, and disinfect and anti-inflammatory treatment should be carried out. After the inflammation and bleeding have improved, you should seek medical attention as soon as possible and undergo physical therapy or surgical removal of the corns according to the doctor’s diagnosis.