Metatarsalgia is a general term used to denote a painful foot condition in the metatarsal (ball of foot) region of the foot. This is a common foot disorder that can affect the bones and joints at the ball of the foot. Metatarsalgia is often located under the 2nd, 3rd, and 4th metatarsal heads, or more isolated at the first metatarsal head - near the big toe.
A callus is a protective thickening of the skin that develops due to recurrent friction and pressure. Most calluses are found on the ball of the foot or on the heel; although, calluses can form in other places on the foot. Full Story