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Roseola (roseola infantum) is a mild illness caused by a virus. It is generally harmless and is most common in children 6 months to 2 years of age. It is rare after age 4. Roseola is caused by two common viruses.
URL of this page: //medlineplus.gov/ency/article/000968.htm. Roseola is a viral infection that commonly affects infants and young children. It involves a pinkish-red skin rash and high fever. Roseola is common in children ages 3 months to 4 years, and most common in those ages 6 months to 1 year. It is caused by a virus called human herpesvirus 6 (HHV-6), although similar syndromes are possible with other viruses.