Pain on the bottom of my big toe

When I stand in one place or walk it feels like i'm stepping on a rock, but deep beneath the skin of my toe. It burns and hurts real bad when touched or pressed and feels like something is in my to but towards the bottom. It looks like a slightly dard dot in the middle of the callus but with a a small dimple. Only that spot is sensitive. No other part of the callus on the toe is, just that dot. I had a doctor shave the surface of the callus and do an x-ray but came up with nothing. When the skin grew back a formed back. Sometimes a sharp pain will shoot through for no apparent reason.

Hi,
Two things that may cause a callus to form underneath the big toe include, one, a lack of motion in the big toe joint, meaning when walking the big toe does not bend upwards enough, thus putting a lot of pressure on the bottom of the toe.
Two, a cartilaginous growth on the bottom of the big toe at the level of the joint, and this bone will create excessive pressure on the bottom of the toe.
It is important for your doctor to find the cause of the problem because that is the only way you will ultimately get rid of the problem.
Scraping the callus may give you temporary relief but in most cases it is not a permanent solution.
Marc Mitnick DPM