Callus-like hard bumps in the middle of the foot may be caused by callus, corns, plantar warts and other factors. 1. callus: the disease is mainly caused by long-term pressure and friction of the skin on the soles of the feet, the patient’s soles of the foot local keratin hyperplasia will appear as a hard packet-like bump, usually yellow, thicker in the middle. 2. Chicken eye: the disease is generally due to the foot skin long-term friction, extrusion caused by keratin embolism, the color is yellow, the size is close to the beans, there will be painful symptoms. 3. metatarsal warts: the disease and human papilloma virus infection caused by the soles of the feet may appear keratinous flat papules or plaques, the color of grayish-brown or yellowish-brown, pressure may appear painful. There are many factors that lead to callus-like hard packages in the middle of the foot, and it is recommended that the patient go to the hospital in a timely manner to find out the cause of the disease and carry out the relevant treatment.