And duac gel seems not to be working any more 
She's 13.5, no sign of periods yet and not particularly developed physically (no curves, has the torso of a 9/10 year old just with very long arms and legs...)
She's been using duac gel for the last 18 months or so and mostly it's kept her skin reasonably clear, but over the last couple of weeks her forehead has just erupted with angry-looking blemishes, they've also come up on her back and shoulders - she usually has her hair in a ponytail so that's not part of the problem and she doesn't wear makeup so it's not that either
I'm going to suggest going back to the GP but what might they offer her? I feel so bad for her as she's not having an easy ride as a teenager at the moment with various other issues going on 