The main ingredient of the general cornside patch is salicylic acid, which is strongly corrosive and therefore causes slight pain when used. If salicylic acid comes in contact with the affected skin, the pain will be mild, but if it comes in contact with normal tissue skin, the pain will be more pronounced. During the treatment of corns, pain can also occur if the affected area is rubbed or squeezed. The treatment of corns needs to be done under the guidance of a doctor. Unauthorized use of corns may lead to corrosion of the normal muscle tissue. Before using the patch, you need to clean and soak the corneal area to soften and remove the corneal layer, and then apply the patch to the corneal area. Most of the corns will gradually fall off after about 2 weeks of continuous treatment. Although the medication can cause slight pain, most people can tolerate it. During the treatment period, minimize the friction and squeeze on the corns to avoid affecting the peeling of the corns. After the corneal layer of the corns is gradually peeled off, the dermis layer will gradually be revealed, and salicylic acid will produce a strong painful sensation after contacting the dermis layer. At this time, you need to immediately remove the corns patch, apply medication under the guidance of a doctor to promote the healing of the wound, and wait for the crusted tissue to fall off naturally.