Corns are a thickening of the stratum corneum induced by long-term pressure and friction. After 20 days of freezing treatment for corns, the swelling and pain can be relieved by choosing suitable shoes and socks, applying hot compresses, and applying medication externally. 1. Choose suitable shoes and socks: wear loose shoes as much as possible, correct the deformity in time, use soft cushion to protect the pressurized parts, and often soak your feet in warm water. 2. Hot compresses: insist on using warm water at about 35 degrees every day to promote blood circulation and massage to relieve local pain. 3. Topical medication: mupirocin or erythromycin ointment and other antibiotics can be used externally as prescribed by the doctor to prevent the skin lesions from breaking out and becoming infected and painful. If the swelling and pain symptoms are not relieved in the above ways, or accompanied by other symptoms, you should go to the hospital in a timely manner, to identify the cause and then give targeted treatment.