Q. A 45-year-old woman comes to the physician’s office for multiple painful small swellings and tingling sensations on her legs for the past 2 months. She has no history of fever, animal contact, or drug intake. Her past history shows that she underwent a hysterectomy for multiple fibroids 5 years ago. Her temperature is 98.6°F (37°C), pulse is 86/min, blood pressure is 120/80 mmHg, and respirations are 13/min. Physical examination shows multiple tender erythematous subcutaneous nodules on her lower limbs extending down her knees. Angular purpura around ankles and bilateral sensory deficit along the course of the sural nerve is present. Muscle strength is normal. Rest of the examination is normal. Laboratory investigations are shown below. What is the next step in her management?