The duration of the corns patch should be determined by the individual patient and should be analyzed on a case-by-case basis, not as a generalization. Corns are a kind of corneal hyperplasia skin disease that occurs on the feet, mainly related to long-term pressure and friction on the feet. The patch contains a high concentration of salicylic acid, which can effectively dissolve the keratin and soften the skin around the corns, and when the surrounding skin is softened, the keratin plugs can be gently peeled off, and the corns will be healed after the wound heals. The corns patch can generally be used continuously for 3 days, and then replaced, using 3-4 corns patch, that is, it takes 7-10 days to heal, if 7-10 days still no obvious effect, it is recommended to go to the hospital to perform cold, laser removal or surgical excision, do not repeatedly paste the corns patch by themselves, resulting in too much damage to the surrounding skin, it is difficult to recover. When using corns, patients need to pay attention to the relatively strong corrosive nature of corns, do not get on the surrounding skin tissue to avoid damage to the surrounding skin. In addition, pay attention to waterproofing to prevent bacterial infections from occurring.