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this looks exactly like the rash my dd had. Her illness started with a fever which lasted for 3 days and she was really grouchy, seemd to have lost her balance and just wanted to lie down. As all of this improved she came out with a rash all over her front and back, neck, face and around her ears which looked like heat rash but became blotchy as well.
Having looked at another thread (sorry can't find it now) I am sure it was Roseola.
This looks similar to what DD had when we were on holiday last year. She had a high temperature, then a rash a couple of days later. That spread all over her body too. She was prescribed Piriton and it was gone in a couple of doses. She didn't seem particularly bothered by it, in fact had run round on the beach all day. We hadn't notice the rash because she was in a wet suit.