I've noticed today that ds (almost 27 months) has been scratching his bum A LOT! He's completely out of nappies now during the day so I can't see why he would have nappy rash. I've had a look at his bum and it is very red around his anus and also looks bruised. He said it was sore when I was having a look. Does anybody have any ideas of what it could be? Thanks 