Laser resurfacing guide: ablative vs fractional, CO2 vs erbium, downtime, and skin tone safety

Laser resurfacing is the category of laser treatments that deliberately damages the outer skin layers to stimulate new skin growth — improving texture, tone, wrinkles, scars, and sun damage. The spectrum runs from aggressive (full ablative, 2-week downtime) to gentle (non-ablative fractional, 2-day downtime). Here's how to navigate the options.

The fundamental distinction: ablative vs non-ablative

Ablative lasers vaporize the outer skin layer (epidermis) entirely in treated areas. Maximum results, maximum downtime.

Non-ablative lasers heat the dermis (deeper layer) while leaving the epidermis intact. Minimal downtime, progressive results over multiple sessions.

Fractional lasers (ablative or non-ablative) create microscopic treatment columns in a fraction of the skin area — leaving surrounding untreated "bridges" to accelerate healing. Fractional technology allows stronger treatments with less downtime than full-field ablative.

Ablative resurfacing: CO2 vs erbium

CO2 laser (full ablative)

The gold standard for significant skin rejuvenation. CO2 (carbon dioxide, 10,600 nm wavelength) vaporizes the epidermis and heats the dermis deeply.

What it treats best:

Deep wrinkles (perioral lines, crow's feet, forehead rhytids)
Actinic keratoses and sun damage
Scars (acne, surgical, traumatic)
Significant skin laxity (dermal heating stimulates collagen remodeling)
Significant texture irregularity

Downtime: 7–14 days of active healing. Skin weeps, crusts, and peels before the new epithelium forms. 3–6 months of pinkness/redness follows. Full healing: 3–6 months.

Who performs it: Dermatologists, plastic surgeons, oculoplastic surgeons. Rarely performed at med spas; typically done at dermatology or surgical practices.

Skin tone restriction: Full ablative CO2 is generally appropriate for Fitzpatrick I–III only. Fitzpatrick IV–VI patients face significant risk of post-inflammatory hyperpigmentation (PIH) and permanent hypopigmentation from full ablative CO2.

Cost: $1,500–$5,000+ per treatment (single session, often). The extent of treatment (full face vs zones) affects cost significantly.

Erbium:YAG laser (full ablative)

Erbium (2,940 nm) ablates more precisely than CO2 with less surrounding thermal damage — it's a "colder" ablation. Less collagen remodeling stimulation but faster healing.

Advantages over CO2: Faster healing (5–10 days vs 7–14), less thermal injury, can be used on slightly darker skin tones (Fitzpatrick III–IV with care).

Disadvantages vs CO2: Less collagen stimulation, less improvement in deep wrinkles and laxity.

Best for: Patients wanting resurfacing with faster recovery, surface texture and pigment issues, patients with Fitzpatrick III–IV skin who need ablative treatment.

Fractional ablative: the middle ground

Fractional CO2 and fractional erbium create columns of ablation covering 15–40% of the skin surface, leaving surrounding skin intact. This allows meaningful resurfacing results with significantly less downtime than full ablative.

Common devices:

Fractional CO2: Lumenis ActiveFX/DeepFX, Cynosure PicoSure (non-ablative component), various CO2 platforms with fractional modes
Fractional erbium: Fotona SP Dynamis, Sciton ProFractional

Downtime: 4–7 days of healing (vs 7–14 for full ablative). Some redness for 2–4 weeks.

Sessions: 1–3 sessions spaced 6–12 weeks apart. Fewer sessions than non-ablative fractional.

Skin tone: Fractional CO2 — Fitzpatrick I–III; fractional erbium can extend to Fitzpatrick IV with caution and proper pre-treatment.

Cost: $800–$2,500 per session.

Non-ablative fractional resurfacing

Non-ablative fractional lasers (the most accessible category at med spas) heat micro-columns in the dermis without removing the epidermis. Results build over months, not visible immediately. Multiple sessions required.

Fraxel Dual (1550/1927 nm)

The reference non-ablative fractional device. Two wavelengths:

1550 nm — deeper penetration; collagen remodeling, scar treatment
1927 nm — more superficial; pigment, melasma, surface texture

What it treats: Acne scarring, fine lines, melasma (1927 nm), general skin quality and texture.

Downtime: 4–7 days of swelling, mild peeling, and redness. Much less dramatic than ablative.

Skin tone: 1550 nm can be used on Fitzpatrick I–IV with appropriate settings and pre-treatment. 1927 nm requires more caution on darker skin.

Sessions: 3–5 sessions, 4–6 weeks apart.

Cost: $800–$1,500 per session.

MOXI (Sciton, 1927 nm)

A gentle entry-level non-ablative fractional laser. 1927 nm treats surface pigment and texture with very mild downtime.

Best for: Maintenance patients, patients with melasma or mild sun damage, patients with limited downtime tolerance, and darker skin tones (Fitzpatrick III–IV).

Downtime: 1–4 days of mild peeling ("MOXIe" — a common term for the small flaking particles that shed).

Results: Subtle — appropriate for skin maintenance, not dramatic correction. Often combined with BBL (Broad Band Light) for a "MOXI + BBL Forever Young" treatment.

Sessions: 3–4 sessions, 4–6 weeks apart.

Cost: $400–$700 per session.

The downtime spectrum at a glance

Treatment	Downtime	Fitzpatrick safety	Sessions	Results
Full ablative CO2	7–14 days + 3–6 months redness	I–III only	1	Dramatic
Full ablative erbium	5–10 days + 2–4 months redness	I–IV (caution)	1–2	Strong
Fractional CO2	4–7 days + 2–3 weeks redness	I–III	1–3	Moderate-strong
Fraxel Dual (1550)	4–7 days	I–IV	3–5	Moderate
Fraxel Dual (1927)	3–5 days	I–III (caution IV)	3–5	Moderate
MOXI (1927)	1–3 days	I–IV	3–4	Mild
Halo (hybrid)	5–7 days	I–III	1–2	Moderate-strong

Skin tone safety: the Fitzpatrick scale and melanin risk

Patients with Fitzpatrick IV–VI skin (olive, brown, dark skin tones) have a significantly higher risk of post-inflammatory hyperpigmentation (PIH) and hypopigmentation from aggressive laser treatments. The risk is highest with:

Full ablative CO2
High-energy fractional ablative
Non-ablative lasers not calibrated for melanin-rich skin

Safe options for Fitzpatrick IV–VI:

MOXI (1927 nm, low settings)
1550 nm fractional at appropriate settings with experienced provider
Erbium ablative with caution and proper patient selection
Nd:YAG 1064 nm for specific concerns (vascular, hair removal)

Pre-treatment protocol for darker skin types: Many providers use topical hydroquinone, kojic acid, or retinoids for 4–6 weeks before any laser to suppress melanocyte activity and reduce PIH risk.

If you have Fitzpatrick IV–VI skin: Insist on a provider with documented experience treating darker skin tones specifically with your target treatment. This is not the area to see a generalist.

Pre- and post-treatment protocols

Before laser resurfacing:

Avoid sun exposure and use SPF 30+ daily for 4–6 weeks pre-treatment
Discontinue retinoids 5–7 days before (can impair healing)
If herpes simplex history (cold sores), take antiviral prophylaxis starting 2 days before and continuing 5 days after
Stop vitamin E, fish oil, NSAIDS 5–7 days before (reduce bruising)

After laser resurfacing:

Follow provider's specific wound care protocol (typically petrolatum-based occlusive dressing)
Avoid all sun exposure during healing
Begin SPF 30+ once re-epithelialized
Hold retinoids until fully healed (typically 4–6 weeks)

Questions to ask before booking

For my skin type (Fitzpatrick scale), what is the safest laser option that achieves my goal?
What is the realistic downtime for the specific treatment you're recommending?
How many sessions are included in the course and what's the expected timeline for results?
For acne scarring specifically: are you recommending fractional ablative or non-ablative, and why?
What pre-treatment protocol do you recommend for my skin tone before the procedure?

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