I had acne for many years, worse at different times. I am now almost 40 and some scarring was inevitable. After a first session of deep CO2 my skin seemed to improve. After 6 months I had another acne burst (stress related), and went back for another session + a month of tetracycline. During this second session the doctor double passed over the worse spots. Yet... now my pores look larger, some scars even deeper. Why did this happen and how should I fix it?