Yesterday 3yo DD complained a couple of times that her chin hurt, but it looked fine then - nothing out of the ordinary and not seen her scratching it or anything. This morning, she's woken up with this. It's not quite a rash, not quite a sore, the colour looks like there might be some pus - never seen anything like it. Any guesses what it is? (Trying to get a GP e-consult as well, of course, but often easier said than done).