Feels like I have a stone in the ball of my foot? Sharp pain?

I went to the podiatrist and they told me
It was a callus but i know it’s not because the pain is so sharp and when I walk the ball of my foot hits the ground and it feels like I’m walking on a stone or have a rock on the ball of my foot and it’s also numb too? What could it be? What do I do?
Feels like I have a stone in the ball of my foot? Sharp pain?
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