Will the hyaluronic acid injections (5 months post-op) affect a CO2 Laser treatment's effectiveness?

This shouldn't affect the treatment. Acne scars need a combination approach for long-term improvement. Everyone has a unique pattern of acne scarring, and most people have various types of scars, so we create a tailored treatment plan for each patient. We often use:
- Injectable fillers like Bellafill and Sculptra (with or without subcision) for atrophic, indented scars.
- Subcision for depressed, tethered scars.
- Vascular lasers like Yellow laser, Aerolase, excel V, BBL, or IPL for redness or thick acne scars.
- Lasers such as Fraxel, Erbium, CO2, Halo or fractional radiofrequency (Venus Viva, Skinfinity, Morpheus, PiXel8, Fractora, Intensif microneedling RF) for textural issues and superficial scarring.
- TCA CROSS and punch excision for deep ice pick scars and narrow box car scars.

All lasers are combined with microneedling/PRP to improve the results and accelerate your healing time. Keep in mind that a personalized combination treatment by an expert physician will give you the improvement you're looking for. I recommend getting a formal evaluation with an experienced cosmetic dermatologist and acne scarring expert. Best, Dr. Emer. ​