A 2-year-old Hispanic boy experienced a recent severe flare of a rash. When he was just a few months old, itchy patches had appeared on his face, arms, and legs. These lesions had been well controlled with petrolatum (Aquaphor) and hydrocortisone. Over the past three days, however, he had developed an acute eruption, beginning with a few small blisters around his mouth that quickly developed crusting and turned to punched-out ulcers. The patient had fevers up to 102°F at home and was feeling ill.
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