A 45-year-old man presents to an outpatient clinic complaining of persistent right heel pain over the past three weeks. He describes the pain as a deep ache on the sole of his heel, particularly severe with his first steps out of bed in the morning. The discomfort tends to lessen after about 20 minutes of walking but progressively worsens throughout the day, especially after prolonged standing at his construction job. He denies any recent trauma, redness, or swelling. His past medical history is notable for well-controlled hypertension, and he occasionally drinks alcohol but denies smoking or illicit drug use. On physical examination, his vital signs are stable. Examination of the right foot reveals no visible ecchymosis, erythema, or swelling. However, there is marked tenderness to palpation at the medial plantar aspect of the calcaneal tuberosity, and this tenderness is exacerbated with passive dorsiflexion of the toes. Range of motion of the ankle is full and painless. The remainder of his lower extremity examination is unremarkable, with intact neurovascular status. What is the most likely diagnosis and the immediate initial management strategy?

A 48-year-old female presents to an outpatient clinic complaining of persistent discomfort along the sole of her right foot, which has progressively worsened over the past six months. She describes the sensation as a burning ache combined with intermittent numbness and tingling that primarily affects her heel and extends towards her toes, particularly after prolonged standing or walking, but also sometimes bothers her at night, waking her from sleep. She finds that traditional rest offers minimal relief. Her medical history includes a remote ankle sprain from years prior and she follows a pescatarian diet. She denies any back pain or recent trauma. Her vital signs are stable: temperature 36.8°C, blood pressure 128/80 mmHg, pulse 75/min, and respirations 14/min. Physical examination of the right foot reveals no visible swelling or erythema. Palpation along the posteromedial aspect of the ankle, just inferior to the medial malleolus, elicits reproduction of her characteristic burning and tingling sensations. Motor strength is 5/5 in all foot muscles, and deep tendon reflexes are 2+ bilaterally in the lower extremities. Sensation to light touch is diminished over the plantar aspect of the foot compared to the contralateral side. Which of the following is the most likely diagnosis and appropriate initial management strategy?