Foot corns under the ball of the foot can be very painful. The main reason for having corns under this part of the foot is because the metatarsal bones are protruding through the fatty padding. This can be due to 2 reasons one either the fat pad has become thinner which is very common with Indian subcontinent feet. There is very little fatty padding on the sole of the feet and this diminishes with age. The arches are usually normal to high in this foot type which puts more pressure on the sole of the feet.
In another common case, where a bone in the forefoot has dropped, it pushes through the flatly padded layer and compresses the skin. In both cases the skin on the sole of the foot reacts by thickening. It thickens to the hardness of toenail. It is unique to the foot this type of hard skin.
Foot corns tape is used to pull the fatty padding back into place as well as lifting the bones back up. Use every day for 28 days to see results. The hardened skin stops growing after 3 months so repeated use of foot corns for 12 weeks / 3 months is advised.