Why Is My Skin Oily And Breaking Out After Healed Cheek Abscesses, And How Can I Treat The Large Dark Marks And New Acne?

Hi, I had developed face abscess on cheeks, that have been completely healed now.. but there black marks are so big .. before these abscesses my skin was normal I didn t have any acne issue.. but now my skin is oily and despite of all precautions acne appears... I have used mizicin and clerit gel also..