An Morton's neuroma is a somewhat frequent sore condition involving the front of the toe. In between the metatarsal bones in the pad of the toe, there are nerves, and these nerves could be inflamed if compressed 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