My daughters foot started hurting about 3 weeks ago now she feels a little round painful lump in the arch of her foot.what do you think it could be ?

Is your daughter a diabetic. My fiance' has the same problem in both feet. No body knows what to do. But they say it is related to diabeties. Diabetic neuropathy. You can research it it iwhen your blood sugars are too high for long period of times