A 42-year-old woman is evaluated for a 2-month history of left foot pain between the third and fourth toes, accompanied by a burning sensation and the sensation of walking on a pebble. She has not experienced any trauma in the area, and she does not have edema or erythema. Symptom onset was insidious, and the pain only occurs when she is standing or walking. She works as a restaurant hostess and wears high-heeled shoes for her job. On physical examination, vital signs are normal. The left foot appears normal, with no palpable abnormalities or tenderness between the third and fourth toes. Sensation is intact throughout the foot, and posterior tibial and dorsalis pedis pulses are palpable. What is the most likely diagnosis?