Done the glass test and that's fine.
I can't remember exactly how DS1 and 2's spots started off but I seem to recall the very start was very much like a very faint rash of spots.....
Just changed DS3 and discovered it all over his tummy, in his nappy area, and a bit on his back.
He's going to have them bad like DS2 did I think. DS1 was covered fairly lightly when he had them - DS2 was like "dot man".....