The skin is white after the patch of corns, may be corroded by the salicylic acid in the patch of corns part of the stratum corneum cells, may also be caused by the stratum corneum cells absorb a lot of water, whether it needs to be cut off to be considered according to the length of time and symptoms of medication. A, need to cut off: 1, too long: the use of corns paste recommended 24 hours to replace once, if there is no abnormal discomfort in the daily, but also appropriate to extend the use of 2-3 days. If the local skin appears to turn white at this time, you can carefully cut off the whitened skin to reveal relatively normal skin, wash your feet and then replace with a new cornsore patch. Removal of corns usually requires 3-4 applications of the corns patch, and the whitened skin and residual medication should be removed before each change. Severe corns can increase the course of treatment according to the situation; 2. Pain: If the skin becomes white and painful, suggesting that the corns paste on the paste parts of the skin irritation, you need to disinfect and observe whether the local skin appears red, swollen, broken and other symptoms, the epidermis is intact, you can cut off the whitened skin, be careful not to use excessive force, so as not to damage the normal skin. If the skin is broken, the broken part can no longer continue to use the cornside patch. Second, do not need to cut off: if the use of time not more than 24 hours, and no local pain, redness and other symptoms, may be due to the use of corns eye patch skin is not breathable, whitening phenomenon, do not need to immediately cut off the whitening of the skin. General corns eye patch need to paste about 24 hours to give full play to the effect of the drug, you can replace the new corns eye patch after proper cleaning of the skin and observe the skin reaction. In order to avoid recurrence of corns, you should abandon the shoes that do not fit your feet, try to wear loose shoes, shoes can be padded with soft sweat-absorbing insoles, do not wear high heels. The use of corns patches may increase the risk of infection and slow healing in diabetic patients and is not recommended.