In short. Fractional resurfacing treats skin in a pattern of narrow columns, leaving untreated skin between them to support healing. Ablative devices (CO2, erbium) vaporise the column; non-ablative devices leave the surface intact and heat the dermis. The choice is a trade-off: stronger effect against longer downtime and higher pigment risk. On darker skin, non-ablative is usually the safer first choice.
Key points
- Fractional means columns, not a continuous sheet.
- Ablative removes surface; non-ablative spares it.
- Stronger effect brings longer downtime and pigment risk.
- Non-ablative is usually safer first on Asian skin.
- Multiple lighter passes beat one aggressive pass.
Ablative or non-ablative?
| Ablative (CO2, erbium) | Non-ablative (1540/1565 nm) | |
|---|---|---|
| Surface | Column vaporised | Intact |
| Target | Deep dermal repair | Dermal heat |
| Effect | Strong | Moderate |
| Downtime | 1–2 weeks of crusting | 1–3 days of redness |
| Pigment risk | Higher | Lower |
| Best for | Selected scars, deep texture | Mild texture, tone |
What does it treat?
Acne scars, fine to deep wrinkles, surgical and traumatic scars, photodamage, stretch marks, and texture change from chronic sun exposure. It does not treat pigment primarily, though it removes surface brown spots as part of resurfacing. For diffuse redness, melasma, or unwanted hair, other tools are appropriate.
What happens in a session?
After assessment and pre-treatment skincare, topical numbing is applied for thirty to sixty minutes. The clinician passes the handpiece in overlapping passes. The session takes thirty to ninety minutes. Ablative treatment weeps and crusts for one to two weeks; non-ablative has only a day or two of redness.
Which is safer on Asian skin?
Non-ablative fractional resurfacing is usually the safer first choice on melanin-rich skin, with ablative treatment reserved for selected scars and only after explicit discussion of pigment risk. Lower density, longer intervals, careful pre-treatment pigment control, and strict sun protection are standard. Multiple lighter passes generally outperform single aggressive passes.
What is recovery like?
Non-ablative: redness and swelling for one to three days, with sandpaper-like texture resolving over a week. Ablative: weeping and crusting for one to two weeks, with pinkness that can last weeks to months. Strict sun protection, gentle barrier care, and avoidance of irritants are universal. Pigment-control topicals resume after re-epithelialisation.
What are the risks?
Expected: redness, swelling, and planned texture change during recovery. Less common: prolonged redness, post-inflammatory hyperpigmentation, hypopigmentation, scarring, and infection. Improvement is gradual and often needs multiple sessions.
When should treatment be deferred or reviewed?
- Active tan, recent sunburn, or photosensitizing medication.
- Active eczema, melasma, or keloid tendency.
- Signs of infection, persistent bleeding, or severe swelling.
Sources
- NICE — guidance on laser resurfacing
- American Society for Laser Medicine and Surgery — fractional laser safety
- Cochrane Library — reviews of fractional resurfacing for scars
Internal links
Frequently asked questions
What is the difference between ablative and non-ablative fractional treatment?
Ablative devices vaporise the column, removing surface and stimulating deep dermal repair. Non-ablative devices leave the surface intact and deliver heat to the dermis, producing more modest collagen change with much faster recovery. The choice is a trade-off between effect and downtime.
What does fractional resurfacing treat?
It is used for acne scars, fine to deep wrinkles, surgical and traumatic scars, photodamage, stretch marks and texture change from chronic sun exposure. It does not treat pigment primarily, though surface brown spots are removed as part of the resurfacing.
Which option is safer for Asian skin?
Non-ablative fractional resurfacing is usually the safer first choice on melanin-rich skin, with ablative treatment reserved for selected scars after explicit discussion of pigment risk. Lower density, longer intervals and multiple lighter passes generally outperform single aggressive passes.
Risks & Limitations
- Burns and blistering if settings do not match the skin.
- Post-inflammatory hyperpigmentation, particularly in darker skin types, which may take months to settle.
- Hypopigmentation (lightening) of treated skin, which can be permanent.
- Scarring, including hypertrophic scarring, which is uncommon but real.
- Infection, including reactivation of herpes simplex after resurfacing.
- Acne or milia flare during recovery.
- Results are incremental and most concerns need several sessions. Melasma may rebound or worsen with aggressive treatment.
When to Seek Care
- Blistering, weeping or broken skin beyond the expected reaction.
- Severe pain that is worsening rather than settling.
- Spreading redness, warmth, pus or fever.
- New darkening or firmness that looks like scarring at the treated area.
- Any change in a treated pigmented lesion — it should be reviewed, not retreated.
References & Further Reading
- American Academy of Dermatology (AAD) — laser and energy device information
- American Society for Laser Medicine & Surgery (ASLMS)
- National Medical Products Administration (NMPA, China) — device registration status
- Cochrane Library — systematic reviews in laser dermatology
This page is patient education, not medical advice, and it does not cite individual studies. Discuss your own case with a qualified clinician. To arrange an assessment at Chongqing West District Hospital, see Contact & Consultation.