Why? My 5 year old had a rash all last summer, not a clue what it was or what caused it.....just a virus messing with the immune system we were told.
Because if everyone who had covid got a rash (and it happened very early on) then it would be easier for people to be aware of it rather than it lying unseen for days.
Just a hypothetical to say that lockdown would be easier to manage, that's all.