What are Foot Corns & Calluses? What are Foot Corns & Calluses? A callus is an area of hard, thickened skin that can occur across the ball of the foot, on the heel, or on the outer side of the big toe. While many consider .Read More... 12 Dec 2014 by Suzette Clements, DPM Podiatrist Corner Calluses, Corns, foot care, foot conditions, foot treatment, Footwear, Shoe Lovers, Shoes, superb