Exanthema Subitum, also known as Roseola Infantum, is a common viral illness that primarily affects infants and toddlers. Symptoms include high fever, followed by a pinkish-red rash that appears on the trunk, neck, and arms. There are several synonyms for Exanthema Subitum, including Sixth Disease, Rose Rash of Infancy, Three-Day Fever, and Baby Measles. These terms are used interchangeably in medical literature to describe the same condition. While Exanthema Subitum is typically mild and resolves on its own, it is still important to seek medical attention if your child is experiencing symptoms. Left untreated, it can lead to complications such as seizures and pneumonia.