Review Question - QID 109579

A 15-year-old male teenager is brought in to see his pediatrician by his mother to examine the patient's acne. The patient asserts that he maintains excellent hygiene. He uses mild soap and water to wash his face and has not manually disturbed any of the skin lesions. However, his mother noticed that 1 of his "acne" lesions ruptured while eating dinner, producing a foul odor and a cheese-like white exudate. The patient has a past medical history of asthma and eczema. His current medications include albuterol, fluticasone, and topical corticosteroids as needed. His temperature is 98.7°F (37°C), blood pressure is 120/70 mmHg, pulse is 90/min, and respirations are 15/min. Examination of the patient's face reveals a firm, movable, non-tender lesion shown in Figure A. The remainder of his scalp, face, and neck are unremarkable. What is the most likely diagnosis?