We had problems with similar sounding rash which turned out to be diagnosed as hives (I'm yet to find out what is causing it!)
I know hives wouldn't cause the temp but maybe the temp is from the ear infection and rash a totally unrelated thing?
It is hard as Ambah said there are so many rashes and things that just can't be explained. Does it seem to be affecting Milo? He appear itchy or anything?