(possible sign of a serious disease, such as meningitis or sepsis)
Signs: The flat splotches look like tiny blood blisters or red splotches under the skin. They don’t itch or fade when you press on them. They’re usually small but sometimes large. The large marks may turn purple. This rash doesn’t itch and can start anywhere on the body. (The baby in the top picture is jaundiced—has yellowish skin—for another medical reason. Children with petechiae won’t necessarily have jaundice.)
Note: These are just examples. The rash may appear differently, and it’s easy to confuse one rash for another.