DS is 4 and in reception. Since coming home from school today he has very red cheeks. He hasn't had a temperature or any other symptoms that you might associate with slapped cheek disease (aside from being tired and grumpy but that's pretty standard after school unfortunately), and he is long past the teething stage.
He had his first forest school session this afternoon and it is very cold here, so I guess it could be wind burn.
Any other suggestions?