CORN, in pathology, a small local outgrowth of the outer skin (epidermis) with great enlargement of the horny layers (callosity). Most of the underlying nerve-bulbs waste away, but, if only one or two remain, pressure on the enlarged part causes acute pain. The condition results from intermittent pressure, par ticularly that of ill-fittinc.); boots. If the horny layers are sheltered from evaporation, e.g., between the toes, the corn is soft. In fection may occur leading to suppuration. The only certain treat ment is removal of the cause, but in otherwise healthy subjects much may be done by hot water bathing, paring with a sharp knife or painting with a solution of salicylic acid in collodion.