A 19-year-old female patient presented to the emergency department with a one-week history of fever, malaise, and progressive eyelid swelling. She had no remarkable past medical history and seemed at ease during her consultation. A physical examination showed the following: blood pressure, 139/82 mm Hg; heart rate, 81/min; temperature, 37.9 °C (100.2 °F); respiratory rate, 16/min; and oxygen saturation, 98% on room air. Marked bilateral periorbital edema (Fig. 1A) and posterior cervical lymphadenopathy were observed.
