6 months on Acnetrex, 20mg per day but I still flare up much worse (Photo)

My derma put me on 10months course of acnetrex treatment by 20mg per day that will end on july 2016. Im on 6months now, as i started last oct 2015 and during those months i experienced a two cystic acne that leave atrophic scars on my left cheeks and also from having dry lips and skin.im wondering why im experiencing acne flare ups on my cheeks that are red and looks like an eczema rash. Is this normal? What wil i do on my scars a pea sized on my left cheeks Please help. Many thanks