An Morton's neuroma is a reasonably frequent painful ailment affecting the ball of the foot. Among the metatarsal joints in the pad of the foot, there are nerve endings, and these nerves could be irritated if squeezed in between those metatarsal bones. As a result of this irritation, fibrosis tissue forms. https://articlebiz.com/article/1052308884-what-is-a-mortons-neuroma-in-the-foot