Exanthem subitum
Means a sudden rash.
A viral disease of infants and young children with sudden onset of high fever which lasts several days and then suddenly subsides leaving in its wake a fine red rash.
The causative agent is herpesvirus type 6 so the disease is known as Sixth Disease.
Also called Pseudorubella, Roseola, Roseola infantilis, and Roseola infantum.