Metatarsalgia is a condition characterized by pain and inflammation in the ball of the foot (the area between the toes and the arch) due to overuse or injury.
A capsule is the tissue that surrounds the joint and helps to hold it in place. When referring to the feet, there are several that attach the toes to the foot.
A foot neuroma causes pain in the ball of your foot, most often between the third and fourth toes, however, it can be present in between any of the toes.