Corns are hard in the center and can be treated by medication, physical and surgical methods. 1. Drugs: such as salicylic acid ointment, urea ointment, corns ointment, etc. First, soak your feet in hot water and scrape off the softened keratin on the corns, then apply the drugs for treatment. 2. Physical: you can choose cryotherapy and laser treatment. Cryotherapy, that is, liquid nitrogen freezing method of treatment. The use of low-temperature liquid nitrogen to freeze the corns locally, two to three days after the blackening of the corns, shedding, to achieve the therapeutic effect. Laser treatment is mainly using laser gasification of corns to achieve therapeutic effects. 3. Surgery: When medication and physical therapy are ineffective, surgery can be chosen to remove the corns. First, local anesthesia, then use scalpel to dig out the corns along the edge of the keratinous plugs, and then use sterilized gauze bandage. In addition, it is recommended that patients with corns that are hard in the middle should go to the hospital in time and follow the doctor’s instructions for treatment to avoid delaying the condition.