Strange bump on bottom of foot.

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Hello, approximately 2 months ago my husband discovered this little black dotted bump on his foot. At the time, we thought perhaps it was a splinter that would eventually make its way close enough to the edge for us to tweeze out. However, that didnt happen because the spot disappeared. He left it alone for the first two weeks, gradually feeling pain due to the pressure on his foot from walking.

We checked it out and realized it had become a rough feeling bump. It was almost like a little rock wedged itself into the foot, making it appear like a bump. My aunt thought it could be a bubble, so she decided we should try to pop it. Yet nothing happened.

This is how the bump looks :





If you might have any idea about what this might be or is please any open ideas would be helpful. Right now its a really rough bump that just has an empty hole.