Final answer:
The symptoms described may indicate a condition called Morton's neuroma, which causes pain and discomfort in the ball of the foot. The most appropriate management is to avoid tight-fitting shoes, wear shoes with good arch support, and use metatarsal pads to relieve pressure.
Step-by-step explanation:
The symptoms described - left foot pain between the third and 4th toes, accompanied by a burning sensation and the sensation of walking on a pebble - may indicate a condition called Morton's neuroma. Morton's neuroma is a thickening of the tissue around one of the nerves leading to the toes. It often causes pain and discomfort in the ball of the foot and feels like there is a pebble in the shoe. The most appropriate management for Morton's neuroma would be to avoid tight-fitting shoes, wear shoes with good arch support, and use metatarsal pads to relieve pressure on the affected area. In some cases, a doctor may recommend corticosteroid injections or surgery to remove the neuroma.