Summary
Corns are areas of skin where corneas are more likely to develop due to chronic friction or pressure. Their central spur grows deep into the cornea, causing pain for the patient sooner or later, which, however, quickly disappears when the skin change is treated. Preferred locations for this problem are the feet, as they are predisposed to being exposed to excessive pressure over a long period of time due to inappropriate footwear or the presence of foot malpositions (or a combination of both).