Newborn Rashes 1. A common newborn rash is erythema toxicum. It appears on the second or third day of life. They look like insect bites, but are not. This rash does not require treatment.
Many newborns develop acne of the face - mainly small red bumps.
This neonatal acne begins at 3 to 4 weeks of age and can last until 4 to 6 months of age. The cause appears to be the transfer of maternal hormones just prior to birth. Since it is temporarily, no treatment is necessary. Baby oil or ointments make it worse .