A 1-day-old neonate is evaluated in the neonatal unit due to the appearance of a rash. The rash is diffusely spread over his trunk and extremities. The patient was born at term via spontaneous vaginal delivery. The mother had a history of STI, for which she was treated a year ago. She is breastfed every 2 hours and requires multiple changes of diapers. Temperature is 36.8C (98.4 F), pulse 110/min, and respirations 36/min. There are erythematous papules and pustular lesions over the skin shown in the exhibit on examination. Palms and soles are spared. The rest of the examination is unremarkable.