Intractable plantar keratoma is a medical condition characterized by a thickening of the skin on the bottom of the foot, which results in the formation of a hard, painful, and sometimes cracked area of skin. It is also known as plantar callus or a plantar corn. This condition can be caused by repetitive pressure or friction on the foot, and it can be difficult to treat without the help of a medical professional. In severe cases, intractable plantar keratoma may require surgical removal.