Sorry to hear you are troubled by post acne red and brown marks. These are very common in acne patients and of course a source of concern. It is most important to first ensure active acne is no longer an issue, as each new acne spot can potentially leave a new mark on your skin.
From my experience I will usually target the red marks with a VBEAM laser, which is excellent at shutting down the dilated vessels causing the red marks In addition, I will suggest a non-ablative laser such as Excel V or Genesis laser to even out the brown marks. Good improvement can usually be seen after 2-3 monthly sessions. Do visit a doctor or dermatologist with experience in treating acne scars to help you further.
Warm regards
Dr Stephanie Ho, Dermatologist