A 9-day-old boy was brought to the emergency department by his mother. The infant had been doing well until his most recent diaper change when his mother noticed a rash around the umbilicus (FIGURE), genitalia, and anus.
The infant was born at term via spontaneous vaginal delivery. The pregnancy was uncomplicated; the infant’s mother was group B strep negative. Following a routine postpartum course, the infant underwent an elective circumcision before hospital discharge on his second day of life. There were no interval reports of irritability, poor feeding, fevers, vomiting, or changes in urine or stool output.
The mother denied any recent unusual exposures, sick contacts, or travel. However, upon further questioning, the mother noted that she herself had several small open wounds on the torso that she attributed to untreated methicillin-resistant Staphylococcus aureus (MRSA).
On physical examination, the infant was overall well-appearing and was breastfeeding vigorously without respiratory distress or cyanosis. He was afebrile with normal vital signs. The majority of the physical examination was normal; however, there was erythematous desquamation around the umbilical stump and genitalia with no vesicles noted. The umbilical stump had a small amount of purulent drainage and necrosis centrally. The infant had a 1-cm round, peeling lesion on the left temple (FIGURE) with a small amount of dried serosanguinous drainage and similar superficial peeling lesions at the left preauricular area and anterior chest. There was no underlying fluctuance and only minimal surrounding erythema.