Corns are mostly caused by the entry of foreign objects into the skin locally, followed by hyperplasia formed through repeated friction, generally appearing as wedge-shaped on the surface of the skin. If corns are not treated, they might gradually grow larger or increase in size, causing pain during long-term walking. Even if there is no pain temporarily, treatment is still necessary. It is advised to go to the dermatology department of a regular hospital for surgical removal or use liquid nitrogen freezing. This condition can be prevented from recurring by paying attention to one’s walking posture, shoe-wearing habits, and avoiding stepping on dirty things. Regular exercise to strengthen immunity and avoiding walking barefoot are also beneficial.