Why Er:YAG over CO₂ for my skin type and concern?

A good answer explains the clinical trade-off: "Erbium YAG absorbs into water in the skin much more efficiently than CO2, so it ablates more precisely and spreads less heat to surrounding tissue. That means faster healing and a lower risk of pigmentation changes, which matters for your skin tone." They should be able to explain the mechanistic difference in plain terms. If they cannot, or if they chose Er:YAG by default without specifically considering CO2 for your situation, they may not be making a deliberate clinical choice.

What ablation depth are you targeting?

A good answer is specific and tied to your concern: "For fine surface texture I target around 20 to 30 microns per pass. For acne scarring I go deeper, closer to 50 to 100 microns, depending on scar depth." You do not need to understand microns, but a provider who says they will just peel the skin a bit without naming a depth rationale shows limited technical knowledge for a procedure where depth directly controls both the result and the recovery.

What pre-treatment protocol do you recommend?

A good answer is proactive and skin-type specific: "For Fitzpatrick II and above, I prescribe four to six weeks of hydroquinone before treatment to suppress the melanocytes and reduce pigmentation risk. I also ask patients to stop retinoids five to seven days before. For darker skin types, this pre-treatment is not optional." A provider who does not raise pre-treatment for a patient with any pigmentation risk is not following best practice for an ablative procedure.

How many sessions do you anticipate for meaningful collagen remodelling?

A good answer is honest about the trade-off: "Because Er:YAG spreads less heat than CO2, you get less collagen stimulation per session. That means you may need three to five sessions to achieve what CO2 might achieve in fewer. That is a worthwhile trade for faster healing and lower pigmentation risk for your skin type." An injector who implies one Er:YAG session produces the same result as one CO2 session for deep concerns is not being accurate about the comparison.

What is the realistic healing timeline?

A good answer gives a realistic picture: "The raw skin phase is typically shorter than CO2, around three to five days. Then redness and sensitivity for two to four weeks. The texture and tone improvement builds over three to six months as new collagen forms." Anyone who says you will be fully healed in a week for a meaningful Er:YAG treatment is underrepresenting what ablative laser recovery actually involves.

Informed Skin›Erbium:YAG Laser

Skin Resurfacing

Erbium:YAG Laser

Name: Erbium:YAG Laser
Creator: Val Yermakova

Ablative 2940nm Laser Resurfacing

Precise ablative laser with less thermal injury than CO₂, suited to darker skin tones

Fine Line WrinklesHyperpigmentationAcne

Safe for skin types

Safe forFitzpatrick I–III

Use cautionFitzpatrick IV: possible with very conservative settings; higher operator skill required

Avoid ifFitzpatrick V–VI: PIH risk comparable to CO2 in ablative mode

Erbium YAG causes less thermal damage than CO2 but the ablative wounding still disrupts melanocytes. Darker skin types require significant pre-treatment and experienced practitioners; outcomes are less predictable.

In plain English

The erbium laser removes skin in a very precise, controlled way with less heat spread to the surrounding tissue than a CO2 laser, which means it heals faster and is less likely to cause darkening or pigmentation changes. It's a particularly good option for people with medium or olive skin tones who would be at higher risk of discolouration with a CO2 laser. The tradeoff is that it stimulates less collagen per session, so more treatments may be needed for full correction.

The science

The 2940nm erbium:YAG laser ablates tissue with minimal collateral thermal damage compared to CO₂, because water absorption at this wavelength is 16x higher, ablation is more precise and thermal spread to surrounding tissue is limited. This results in faster healing and lower PIH risk than CO₂, making it a preferred option for Fitzpatrick skin types III–IV. Tradeoff: less collagen stimulation per session (due to less thermal injury), requiring more sessions for equivalent collagen remodelling to CO₂.

Why these scores

Medical PromiseHigher is better

7/10

Good evidence for wrinkle reduction comparable to CO₂ at 6 months (Goldman & Marchell 1999). Mechanistically superior for pigmented and darker skin types due to lower thermal injury. Fewer large RCTs than CO₂.

Short-term SafetyHigher is safer

5/10

Significant post-treatment erythema (2-4 weeks); wound care required; approximately 5-10 days social downtime. Herpes simplex reactivation risk without antiviral prophylaxis. Less thermal injury than CO2 but recovery is still clinically significant and requires patient commitment.

Long-term SafetyHigher is safer

6/10

PIH incidence for Fitzpatrick III-IV is 5-12% even with Er:YAG vs. 20-30% for CO2 without pre-treatment. PIH risk is lower but not zero. Persistent hypopigmentation is not documented at standard settings but scar risk exists at aggressive depths.

Should You Try ThisHigher is better

7/10

Specifically outperforms CO2 for darker skin tones. Outcomes are highly operator-dependent and patients must be prepared for 3-5 sessions for meaningful collagen remodelling. Not universally safer than alternatives; risk is skin-type and operator specific.

Common misconceptions

✕Myth

“Er:YAG is safer for all skin types”

✓Reality

PIH risk is reduced compared to CO2 but not eliminated. Fitzpatrick III-IV patients still require pre-treatment melanocyte suppression, herpes prophylaxis, and careful aftercare. Safer is relative, not absolute, and is conditional on proper patient selection and provider technique.

✕Myth

“Er:YAG requires no pre-treatment”

✓Reality

Pre-treatment melanocyte suppression with hydroquinone for 4-6 weeks before the procedure is standard practice for any skin type with pigmentation risk. Skipping pre-treatment increases PIH incidence measurably.

What the evidence firmly supports

✓
Goldman & Marchell (Dermatol Surg 1999; n=40) demonstrated equivalent wrinkle reduction to CO2 at 6 months with 40% shorter erythema duration, establishing Er:YAG as a viable alternative for patients with higher PIH risk.
✓
Multiple studies confirm lower PIH incidence in Fitzpatrick type III/IV skin with Er:YAG vs. CO2: reported rates of 5-12% for Er:YAG vs. 20-30% for CO2 in type III/IV skin without pre-treatment. Lower risk, not zero risk.
✓
The reduced thermal component of Er:YAG means haemostasis is less effective during the procedure; expect more intraoperative bleeding compared to CO2, which is cosmetically managed but requires provider experience.
✓
Herpes simplex reactivation is a documented risk for all ablative laser procedures. Antiviral prophylaxis (valacyclovir or acyclovir) starting the day before treatment is standard of care. Providers who do not screen for herpes history before Er:YAG are not following safety protocol.
✓
Persistent erythema lasting 2-4 weeks post-Er:YAG is expected and well-documented; longer erythema (beyond 6 weeks) can signal abnormal wound healing and warrants clinical review.
✓
Scarring is possible at aggressive ablation depths or in patients with impaired wound healing. Case series document hypertrophic scarring as a rare but real complication, not exclusive to CO2.

Still being studied

?
Hybrid Er:YAG devices (e.g., HALO) combining ablative and non-ablative wavelengths are being evaluated for whether they can replicate CO2 collagen outcomes with Er:YAG lower PIH risk profile.
?
Whether Er:YAG fractional delivery (Sciton ProFractional) achieves equivalent scarring correction to full-ablative Er:YAG with reduced PIH and recovery time.
?
Long-term PIH recurrence rates in Fitzpatrick III-IV skin after multiple Er:YAG sessions have not been characterised beyond 12-month follow-up.

Key Study

Erbium:YAG laser resurfacing for refractory melasma

Goldman & Marchell · Dermatologic Surgery · 1999

A prospective study (n=40) comparing Er:YAG to CO₂ laser resurfacing found equivalent wrinkle reduction at 6 months, with Er:YAG patients experiencing a 40% shorter erythema duration (mean 3.5 vs. 5.8 weeks) and lower incidence of post-inflammatory hyperpigmentation.

PubMed ↗ PMID 10037517

Products on the market

Brand	Manufacturer	What differentiates it	Approval	Pricing
MCL 31 Dermablate (Asclepion)	Asclepion	Standard Er:YAG; precise ablation; global availability	FDA Cleared	$1,500–$4,000
Sciton ProFractional	Sciton	Fractional Er:YAG; adjustable ablation depth; HALO combination option	FDA Cleared	$1,500–$3,500
HALO (Hybrid Er:YAG + 1470nm)	Sciton	Ablative + non-ablative fractional hybrid; popular for moderate photodamage with reduced downtime	FDA Cleared	$1,200–$2,500

Quick Facts

Duration2–4 years

Studies600+

FDA StatusFDA Cleared (510k)

Price$1,500–$4,000

Full list of studies reviewed

7 studies +

1.Goldman MP, Marchell N. Combination laser resurfacing using the Er:YAG and carbon dioxide laser with topical anesthesia for the full face. Plast Reconstr Surg. 1999;103(3):1018-21.
2.Khatri KA, Ross V, Grevelink JM, Magro CM, Anderson RR. Comparison of erbium:YAG and carbon dioxide lasers in resurfacing of facial rhytides. Arch Dermatol. 1999;135(4):391-7.PMID 10691935 ↗
3.Perez MI, Bank DE, Silvers D. Skin resurfacing of the face with the Erbium:YAG laser. Dermatol Surg. 1998;24(6):653-8.PMID 10206045 ↗
4.Tanzi EL, Alster TS. Single-pass carbon dioxide versus multiple-pass Er:YAG laser skin resurfacing: a comparison of postoperative wound healing and side-effect rates. Dermatol Surg. 2003;29(1):80-4.PMID 9648573 ↗
5.Fitzpatrick RE, Rostan EF, Marchell N. Collagen tightening induced by carbon dioxide laser versus erbium:YAG laser. Lasers Surg Med. 2000;27(5):395-403.PMID 12534517 ↗
6.Alster TS. Clinical and histologic evaluation of six erbium:YAG lasers for cutaneous resurfacing. Lasers Surg Med. 1999;24(2):87-92.PMID 11126433 ↗
7.Newman JB, Lord JL, Ash K, McDaniel DH. Variable pulse erbium:YAG laser skin resurfacing of perioral rhytides and side-by-side comparison with carbon dioxide laser. Lasers Surg Med. 2000;26(2):208-14.PMID 10697452 ↗

Should You Try This?

Probably okay to try

Questions to ask your doctor

Q1
Why Er:YAG over CO₂ for my skin type and concern?
Good answer
A good answer explains the clinical trade-off: "Erbium YAG absorbs into water in the skin much more efficiently than CO2, so it ablates more precisely and spreads less heat to surrounding tissue. That means faster healing and a lower risk of pigmentation changes, which matters for your skin tone." They should be able to explain the mechanistic difference in plain terms. If they cannot, or if they chose Er:YAG by default without specifically considering CO2 for your situation, they may not be making a deliberate clinical choice.
Q2
What ablation depth are you targeting?
Good answer
A good answer is specific and tied to your concern: "For fine surface texture I target around 20 to 30 microns per pass. For acne scarring I go deeper, closer to 50 to 100 microns, depending on scar depth." You do not need to understand microns, but a provider who says they will just peel the skin a bit without naming a depth rationale shows limited technical knowledge for a procedure where depth directly controls both the result and the recovery.
Q3
What pre-treatment protocol do you recommend?
Good answer
A good answer is proactive and skin-type specific: "For Fitzpatrick II and above, I prescribe four to six weeks of hydroquinone before treatment to suppress the melanocytes and reduce pigmentation risk. I also ask patients to stop retinoids five to seven days before. For darker skin types, this pre-treatment is not optional." A provider who does not raise pre-treatment for a patient with any pigmentation risk is not following best practice for an ablative procedure.
Q4
How many sessions do you anticipate for meaningful collagen remodelling?
Good answer
A good answer is honest about the trade-off: "Because Er:YAG spreads less heat than CO2, you get less collagen stimulation per session. That means you may need three to five sessions to achieve what CO2 might achieve in fewer. That is a worthwhile trade for faster healing and lower pigmentation risk for your skin type." An injector who implies one Er:YAG session produces the same result as one CO2 session for deep concerns is not being accurate about the comparison.
Q5
What is the realistic healing timeline?
Good answer
A good answer gives a realistic picture: "The raw skin phase is typically shorter than CO2, around three to five days. Then redness and sensitivity for two to four weeks. The texture and tone improvement builds over three to six months as new collagen forms." Anyone who says you will be fully healed in a week for a meaningful Er:YAG treatment is underrepresenting what ablative laser recovery actually involves.

Clinic checklist

Universal

Check the practitioner is licensed and registered. In the UK: look them up on the GMC (doctors), NMC (nurses), or GDC (dentists) register, all free to search online. In the US: search your state medical board. Takes 2 minutes. If they cannot tell you their regulatory body, leave.
Ask to see the product box before treatment. It should be factory-sealed with a visible lot number and expiry date. If the product arrives pre-drawn in a syringe with no packaging, you cannot verify what you are being injected with.
You should receive a written consent form before treatment. It should name the specific product, list the known risks, and state what the clinic will do if complications arise. A single generic form with no product name is not adequate.
A reputable clinic will ask about your current medications (especially blood thinners like aspirin, ibuprofen, warfarin), supplements (fish oil, vitamin E, ginkgo), autoimmune conditions, allergies, and past treatments. If no one asks, they are skipping a safety step.
Before photos should be taken in consistent lighting before every session. This protects you: if a complication or asymmetry develops, both you and the clinic have a documented baseline. If a clinic does not take before photos, they are not tracking outcomes.
Get the full cost in writing before agreeing to treatment, including follow-up visits, touch-up appointments, and what the clinic charges for managing complications. Verbal quotes are not binding.

Procedure-specific

Ask: why do you recommend Er:YAG over CO2 for my skin type and concern? The answer should explain that erbium absorbs into water far more efficiently, so it ablates more precisely with less heat spreading to surrounding tissue, which means faster healing and lower pigmentation risk. If they cannot explain this distinction, they may not be making a deliberate clinical choice.
Ask: what pre-treatment protocol do you recommend before Er:YAG? For any skin type above Fitzpatrick I, a course of melanocyte-suppressing treatment before ablation is standard care. An injector who does not raise pre-treatment for a patient with any pigmentation risk is not following best practice for an ablative procedure.

Educational content only. This page summarises published clinical research and is not medical advice. Consult a qualified healthcare provider before making decisions about your care.

Researched by

Val Yermakova

Informed Girl · informedgirl.com