A 17-month-old girl presents to the emergency department with a 3-month history of swelling on the roof of her mouth associated with green drainage and gingival swelling. She was evaluated by her primary care provider, who diagnosed her as having an oral abscess and treated her with several days of penicillin, which was then changed to clindamycin after development of a rash. The patient completed a 10-day course of clindamycin with no improvement. Discharge from the lesion was not cultured. The patient’s mother had also noticed a scalp rash over the last several months, which was being treated as seborrheic dermatitis by her primary care physician during this time. She has no previous history of skin disease. She is also being treated for suspected iron deficiency anemia with ferrous sulfate 75 mg (providing 3 mg/kg per day of elemental iron) 3 times daily for 3 months before presentation to the...

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