Review Question - QID 212492

A 10-year-old boy is brought to the clinic by his mother for a rash for the past day. The patient complains that “these bumps are really itchy” and has been scratching them despite protests from his mother. The patient has been relatively healthy with no past medical history except for an episode of otitis media 2 days prior for which he was prescribed antibiotics. His mom denies any change in detergent, clothing, or personal hygiene products but reports that he recently returned from a camping trip 2 days ago. The patient denies fever, weight loss, or chills. Physical examination findings are shown in Figure A. What is the most likely explanation for this patient’s symptoms?