Corns are caused by prolonged squeezing or rubbing, and can be treated by the following methods: 1. Wear loose shoes and stop squeezing or rubbing the area. 2. Treat with corns by applying corns cream to the area with corns and removing it after 24-48 hours, then gently digging out the corns with a blunt blade. If pain occurs, continue to apply the cream topically and repeat until the corns are completely removed.3. Laser treatment: After local anesthesia, burn the corns with a carbon dioxide laser.4. Cryotherapy: Freeze the corns with liquid nitrogen.5.