Q. A 32-year-old woman with Systemic lupus erythematosus receiving immunosuppressive therapy gets admitted to the hospital for fever and painful left leg swelling for 2 days. She says that the fever started first followed by painful leg swelling since yesterday night. Her temperature is 102°F (38.8°C), pulse is 102/min, blood pressure is 100/70 mmHg, and respirations are 15/min. Physical examination shows tender erythematous shiny swelling of the left leg extending from below the knee up to the ankle. Rest of the examination is normal. A complete blood count, an electrolyte panel, and blood cultures are ordered. Intravenous vancomycin is started as an empirical therapy. Within two hours of admission, the patient starts screaming in severe pain. On examination, the swelling of the leg has extended to the whole foot with bullae. Some of the bullae are ruptured oozing thin copious foul-smelling discharge. On palpation, subcutaneous crepitus is felt. What is the best next step in this patient's management?