Key Takeaways
What you need to know
- CO2 gives the biggest change per session but needs about a week of downtime.
- PICO works with minimal downtime but needs more sessions.
- PICO is often the safer choice for medium and darker skin tones.
- Deep scars sometimes need a combination of approaches.
Acne scars are a collagen problem, not a color problem. To improve them, a treatment has to injure the skin in a controlled way so it rebuilds smoother collagen. PICO and fractional CO2 lasers both do this, but they take very different paths.
How fractional CO2 works
A CO2 laser vaporizes thousands of microscopic columns of skin, leaving the tissue around each column intact to speed healing. The deep wound-healing response produces significant collagen remodeling, which is why CO2 delivers the most dramatic improvement per session for rolling and boxcar scars.
Trade-off: expect about 5 to 7 days of redness, swelling and flaking, and pinkness that can last longer. Most people plan treatment around time off work.
How PICO works
PICO lasers deliver ultra-short pulses that create tiny pockets of pressure beneath the surface without burning the top layer. The skin responds by building new collagen and elastin. Downtime is usually a few hours to a day of mild redness.
Trade-off: results build more gradually, so most people need a series of sessions spaced about four weeks apart.
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Side-by-side
| Fractional CO2 | PICO | |
|---|---|---|
| Downtime | About 1 week | Hours to 1 day |
| Typical sessions | 1 to 3 | 3 to 6 |
| Best for | Deeper rolling and boxcar scars, texture | Mild to moderate scars, pigment from old breakouts |
| Darker skin tones | Higher pigment risk, careful settings needed | Generally lower risk |
Which one should you choose?
If you have deeper scars, lighter skin and can take a week off, CO2 often gives the biggest change. If you have medium or darker skin, active lifestyle constraints or post-acne dark marks, PICO is often the better fit. Ice-pick scars may need targeted treatments in addition to either laser. At your assessment we look at scar type, skin tone and your schedule, then recommend one approach or a combination.
Part of our Pigmentation & Skin Clarity guide. For the complete picture, including treatment options, costs and FAQs, read Pigmentation & Skin Clarity: The Complete Utah County Guide.
The Bottom Line
Both lasers improve acne scars, but in very different ways. A side-by-side look at downtime, results, skin-type safety and who each one suits.
Dr. Steven Cherrington, DO
Dr. Steven Cherrington is a Board-Certified Osteopathic Physician and Medical Director at Renova Wellness. With over 15 years of experience in regenerative and aesthetic medicine, Dr. Cherrington specializes in helping patients achieve natural, lasting results through evidence-based treatments.
Editorial Process: Initial content ideas and drafts may be generated with the assistance of AI language models. Every article is then thoroughly reviewed, edited, and medically verified by our clinical team before publication to ensure accuracy, relevance, and alignment with current medical standards.
This content is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare provider for personalized guidance.
