I Have Been Walking Quite A Bit Lately (specifically About

I have been walking quite a bit lately (specifically about 3 hours a day) my feet are flat and I have been having shin splints in the right leg. There is a painful lump on what i think is my tibularis anterior muscle and I am not sure how to remedy it or if it is a terribly bad issue. I am resting it, massaging, applying both tiger balm and extra strength voltarin. Please advise.