Hi, I'm 25, married, I weigh 58kg. In 2014, my dermatologist recommended I use Isotretinoin for 1 year 20mg dosage twice daily for my acne. After my dosage, my face had really improved and the entire 2015 I enjoyed great skin. However, beginning of this year my acne has returned. I've started having many whiteheads and they are painful. What can I do to control this once and for all?