Fever & rash. Roseola is a common frustrating virus, usually experienced in childhood. 3-7 days of varied fevers that can be sustained @105 in toddlers & followed a lacy rash over the trunk & extremities. It often amplifies after a bath or shower. The temperature usually disappears as the rash emerges & the rash may take a couple weeks to fade. Other than feeling rotten with the fever itspretty benign in adults.