Re: lump on ball of foot
Try wearing a metatarsal pad, available at drugstores, under the ball of your foot. You might take an anti-inflammatory like Naproxen, and wear very cushy shoes. It could be a ganglion, a cyst on tendon, or even a plantar wart, but those don't come up all of a sudden. Stay out of high heels, and wear completely flat shoes that transfer the weight of body to the back of foot. Don't go barefoot, even in house, especially on hardwood or tile floors. Any pressure on the lump will cause more pain. Any chance there is a foreign body like a small piece of glass embedded? If signs of infection develop, I would be seen immediately.