Callus in medicine is called callus, foot bunion grinding callus especially painful is generally caused by friction, extrusion. Hydrazine callus is mainly due to long-term skin pressure and friction caused by the thickening of the stratum corneum, mostly occurring in the palm of the hand, soles of the feet, manifested as a waxy yellow or yellow, localized thickening of the plaque. Patients generally do not have special feelings, if the symptoms of pain, generally suffered from friction or extrusion and caused by pain. People with calluses should pay attention to wear comfortable shoes in daily life, avoid localized extrusion, and go to the hospital for treatment if the pain symptoms are serious. In addition, calluses on the feet may also be corns, plantar warts and other diseases, it is recommended to seek medical attention as soon as possible, after a clear diagnosis and treatment as prescribed by the doctor.