Just that really. I've got lots of old acne scars- the flat dark pigmentation- years of picking (sorry). I'm using retinol which is helping now I've got through the ugly phase but still lots of dark marks which I would like to work on. I am a dark olive -about j-lo's colour with dark marks all over really. I've worked on the acne with BHA 2 x daily. I know the nuderm contains hydroquinone, so would love to hear if any of your experiences with it, if it's been worth the spends, or if there are any alternatives.