A Morton's neuroma is a somewhat usual painful disorder involving the pad of the foot. Between the metatarsal bones in the pad of the toe, there are nerves, and these nervous tissue could be inflamed if compressed in between those metatarsal bones. Because of this irritation, fibrous tissue forms. https://articlebiz.com/article/1052308884-what-is-a-mortons-neuroma-in-the-foot