My son woke up with a rash under his fringe a couple of days ago. It looked like chicken pox blisters but was only on his upper forehead and no where else. We wondered if it was a heat rash as he's been wearing a hat. Anyway, when I pulled out his bed, there were a few of these around the edges of his carpet 
. Can anyone help to identify them. Sorry pic quality is awful. Obviously I've had a massive clean up and checked mattress etc, no sign of any more...