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What's your diagnosis?
Bullous Impetigo. A 7-month-old infant was referred to the emergency department with this lesion that was thought to be an inflicted burn injury (child abuse). Aspiration of the lesion showed gram-positive cocci in clusters on Gram stain and culture was positive for Staphylococcus aureus. Posttraumatic paronychia due to S aureus should also be considered in the differential diagnosis.