You should change the medication on time and prevent recurrence after using the corns patch for corns. After 24 hours of applying the corns patch if the affected skin color whitens and slightly painful, you can gently remove the whitened skin and clean up the residual medication on the foot, and then apply a new corns patch. If no such phenomenon occurs, you can properly extend the time of the paste, 3 to 5 days to replace, each time the replacement should be thoroughly cleaned, until pulling out the corns. The main cause of corns is the foot skin localized long-term pressure and friction caused by ordinary shoes should reduce friction and extrusion. If the patient has toe deformity, the patient should be actively corrective treatment, if the foot exophytic bone warts should be surgical treatment. If the patient’s corns are not cured for a long time or recurring episodes, they should go to the hospital in time to find out the cause and actively treat it.