The red acne marks are called post acne erythema or post inflammatory erythema. Lasers can be used to treat these marks to lighten the red marks faster.
It is important to use the correct types of laser - Vascular lasers to treat these conditions.
I recommend Pulsed dye lasers or Copper bromide lasers to treat this condition.
Each type of vascular laser gives different results, downtime and recovery.
It is common to expect 50-80% lightening after 3 sessions.
You might want to speak to your doctor regarding the lack of improvement as there are multiple causes for sub-optimal results (eg laser settings, type of laser, post-laser care…).
Hope this helps!
Warmest regards,
Dr Justin Boey
