I have a burning sensation on the side of my left big toe?

Could be a nerve: An affected nerve can cause burning: either entrapment, trauma, or neuropathy. The formation of a callus while weightbearing may also cause burning in this area.

See below: You may have swelling that is pressing on a nerve. Or if it is along the toenail you may have an ingrown nail.

Nerve: You may have an injury to the nerve on the top of the foot . This can be caused by tight shoes or swelling.