Erythema toxicum neonatorum
（重定向自Toxic erythema）
Erythema toxicum neonatorum (also known as erythema toxicum,, urticaria neonatorum and toxic erythema of the newborn) is a common rash in neonates. It appears in up to half of newborns carried to term, usually between day 2–5 after birth; it does not occur outside the neonatal period.