DS2 has an outbreak of small scabs on the top of his head, around the crown. He's scratching and says they also hurt (though that could be because of all the scratching!). I've checked and checked but no sign of lice or eggs, just the scabs. They appear as a raised red bump with a yellowish crusty scab (sorry if that's TMI).
I've used a different brand of shampoo on him but that was a week ago and they've only just appeared. I'll go back to the old brand of shampoo to be on the safe side but any idea what these could be?