Roseola? Rubella?

Last week Solomon had a low grade fever for two days, no other symptoms. Yesterday he had what looked like a heat rash on his face, then his whole body. Today, all the little bumps are bigger, as in spread out, not taller, and the fever is back. A lot of people said it looks like Roseola, but some said it looks worse than any Roseola they've seen. And Roseola is usually marked by a high-grade fever, not a low grade. So I did some more research and I'm leaning towards Rubella. Rubella is marked with a low-grade fever and starts on the face. The pics of Roseola and Rubella online look a lot alike, but based on symptoms, I'm thinking it's more likely Rubella. Well, if I've got to pick on of the MMR, I'll take Rubella any day! I wonder if the other kids will come down with it... Want some pics?