Newborn Rash (Erythema Toxicum)
The skin of a newborn baby is perfectly adapted to being inside mom's uterus. It was wet all the time, at a constant temperature, and touched only by fluid and the walls of the uterus. Pretty cushy place.
When a baby is born, she doesn't adjust to all the changes right away. Big red blotches can develop all over her body. Sometimes the blotches have whitish centers and almost look like bug bites. Unlike real bug bites, these marks come and go over just a few hours. They are normal in new babies. These red blotches can come and go for two or three weeks. They are harmless, and you don't have to do anything about them.
Thanks to Janelle Aby MD, Stanford School Of Medicine, Newborn Nursery, and Lucille Packard Children's Hospital for the use of occasional photographs.