I used dermaroller for a straight year at first I felt an improvement in the skin but over time I was noticing a worsening in texture and scars. In the last session I was very aggressive with 1.5 mm and seems to have got worse. I am a year without using any invasive treatment and I want to start using this device in conjunction with 15% TCA. I would like to know if it is safe to use in the size of 1.00 mm. I have some indentation, boxscars, ice spick and rolling is mild and are located on the cheeks.