Prostaglandin E-induced polycyclic cutaneous eruption with geometric features.

Prostaglandin E1 (PGE1) is a substance produced by the patent ductus arteriosus that keeps it open. PGE1 can be a lifesaving drug for infants born with ductus-dependent congenital heart disease (CHD) where there is a block of blood flow to the lungs or transposition of great arteries. We present a case of a 36-week, 2-day gestation neonate with CHD who developed bright erythematous annular and polycyclic patches on day 2 of PGE1 administration. When PGE1 dosing was decreased, the rash resolved on its own. Our case demonstrates that PGE1 treatment may not need to be interrupted.