Roseola usually causes a high fever that lasts about three to five days. The fever can reach temperatures as high as 103 to 105 degrees. Just as the fever breaks, a rash usually forms on the trunk.

In roseola, after an incubation period of 5–15 days, infected children develop high fevers that last 3–5 days. This is followed by the acute onset of a rosey pink, nonpruritic macular rash ...