Roseola infantum is a common pediatric rash disease caused by a viral infection. The main symptoms are a persistent high fever lasting 3 to 4 days, followed by a sudden drop in body temperature and the appearance of a rash. Roseola is caused by a viral infection and is not aggravated by water exposure. During the fever period, if the body temperature is below 38.5°C, it is acceptable to use a warm towel to wipe the child's forehead, neck, armpits, and groin to physically reduce the temperature. At the same time, it is important to ensure that the child drinks plenty of fluids. There is no relationship between roseola and water, and during the period of continuous high fever, it is crucial to keep the child hydrated, as a high fever causes significant fluid loss. Moreover, if the child does not receive adequate fluids, the fever may be difficult to reduce, which is an important point to note. Parents should understand that roseola is not exacerbated by exposure to water.