Pain in ball of my left foot

i have been a little nervous about a pain in ball of my left foot, which was damaged two years ago when i kicked an opposing player in his shin with all strength in fotsal game. "it is ill healing of an old sore", i thought. But today's running revealed that new running shoes caused the pain. Upper part of the shoes is constituted by mesh material part for achievement of light-weighting and artificial leather part for reinforcement. i found that inflamed areas of my left foot correspond to the artificial leather part traversing the upper portion of the shoe in the width direction. it's a bad purchase.

Next month, i will entry Shonan Monthly Marathon (i run in this Monthly Marathon three times; two times for 10km and one time for 20km)