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.
Erythema toxicum is characterized by blotchy red spots on the skin with overlying white or yellow papules or pustules. These lesions may be few or numerous. The eruption typically resolves within first two weeks of life.