It is very common to have corns on the bottom of the feet, which is due to long-term local pressure and friction on the skin, and caused by a limited cone-shaped keratinous hyperplasia, needle to bean size, yellowish or dark yellow, smooth surface and skin surface flat or slightly elevated, the boundary is clear, also known as the meat spur. Its treatment is divided into three main aspects, the first is the external erosion agent, that is, the corneal cream or corneal ointment. The second treatment method is physical therapy, such as electrocautery or liquid nitrogen freezing treatment. The third method is surgical local excision.