In Episode 11 of Med School Question of the Week for USMLE, Luke Maxfield, MedSchoolCoach expert tutor, answers this medical school question: A 41-year-old man is brought to the emergency department by his wife with the complaint confusion. He has hypertension, congestive heart failure, and hemochromatosis. His medications include lisinopril and hydrochlorothiazide. The couple recently returned from a trip to the Atlantic Ocean. The patient’s temperature is 39.8 Celsius (102 F), blood pressure is 89/48 mmHg, heart rate is 123/min and regular, and respirations are 23/min. The physical examination reveals a warm erythematous patch on the right lower extremity with an overlying hemorrhagic bullae. What is the most likely diagnosis?