Morton's neuroma, I had this after riding for a few months with a flexy pair of shoes and my cleats too far forward. Mine got much better after I threw the cheapo shoes away and put my cleats further back, I also use a metatarsal pad in my shoes and place it right behind the ball of my foot (between the ball of my foot and my arch). It's a little uncomfortable at first but at least there's no pain. This worked for me. Good luck...