Red rash like patches

Chloe

Noticed some red patches with lighter color dots (looks like blister with no liquid in it) on the side of my baby’s face this morning. Initially thought it might be slapped cheeks. But it faded and the redness appeared on the back of the neck. It just keep moving around the face and even on the scalp. Anyone encountered the same? I’ve got no idea what is it and doc is off today.