I know it is hard to say to a child who sees the damage... but when all else fails, I forget who said it, a painter or photographer, maybe Stiechen, (lovely old fellow a common friend told me) well anyway, we get the face we deserve, and what ever we are given we project who we are. I was, in my teens and twenties in love with a girl with really bad acne problems, and she radiated her love of life and adventure, I don't think many of those of us who loved her, ever noticed her acne. So, keep trying the medicine, but also, remember that folks see what we project more than in which shape we are born. (other than a few idiots who should not get her down!)
Cheers and best wishes
Larry