Tretinoin
"I am the mother of a 13 yr old boy.  His  face was bad. I would say he didn't have a clear spot on his face or back. And he was prescribed the tretinoin cream 0.025. And also an antibiotic called doxycycline mono 100mg.  Doctor said give it a month and we would see a change. That was October 2015. It's now January and month 3/4 and his scars from picking his pimples are so faded you can barely see them. And his back is clear. We use both everyday.  He will still get a pimple here and there but it has given him back his Confidence. The doctor said the longer you are on it the better."