Roseola infantum, also known as baby rose rash, is a viral infection primarily caused by human herpesvirus, leading to a feverish rash disease. The fever often begins suddenly without clear signs, potentially reaching high temperatures of 39 to 40 degrees Celsius. Typically, the fever lasts 3-5 days, after which the temperature might drop suddenly, possibly returning to normal within 24 hours. As the fever subsides, or shortly thereafter, maculopapular rashes appear, mainly on the face, neck, and trunk.