What is a FRACTIONAL CO2 LASER คืออะไร?

Ken Lau
Nov 2
3 min read

Updated: Nov 27

What is a Fractional CO2 Laser, what does it do, and how does it work?

A Fractional CO2 Laser is a laser technology that emits energy in tiny, microscopic beams (fractional) that penetrate deep into the dermis. These micro-columns of laser energy are evenly distributed to stimulate cellular regeneration, promote skin repair, and boost collagen production within the deeper skin layers. This process helps fill and smooth acne scars, improve skin texture, and create a more refined and natural appearance, while reducing the risk of side effects compared to traditional ablative lasers that deliver broader, sheet-like energy.

It is widely used for treating acne scars and can also be adjusted to higher intensities for removing moles, melasma-related spots, and skin tags.

What Is Fractional CO2 Laser?

Fractional CO2 Laser is a laser technology that emits microscopic beams of energy (fractional) that penetrate deep into the dermis.

What Is Fractional CO2 Laser Used For?

It is widely used for treating acne scars by stimulating skin repair and collagen production. This helps fill depressed scars and smooth the skin naturally.

The laser intensity can also be adjusted for removing moles, melasma spots, and skin tags.

How Does Fractional CO2 Laser Work?

A CO2 laser stimulates skin repair and collagen regeneration by delivering numerous tiny beams of energy into the dermis. This creates controlled micro-injuries that trigger cellular healing while minimizing side effects compared to traditional ablative lasers that treat larger continuous areas.

Fractional CO2 Laser for Acne Scar Treatment

Acne scars occur when inflammation or improper acne handling such as squeezing or picking damages the tissue and collagen beneath the skin. The body cannot rebuild collagen in the damaged area as effectively, resulting in depressions or “holes.”

Fractional CO2 Laser delivers 10,600 nm wavelength energy as multiple tiny spots evenly distributed across the treated area. This stimulates the regeneration of collagen and elastin while preserving surrounding healthy skin, helping reduce post-treatment dark marks and improving recovery.

Additionally, the settings can be adjusted:

Higher levels for mole or skin tag removal
Lower levels for gentle skin rejuvenation and brightening

How the Fractional CO2 Laser Works

Creation of Micro-Wounds

The laser creates thousands of microscopic holes through both the epidermis and dermis. These controlled injuries activate the skin’s natural healing process, while surrounding intact skin speeds up recovery.

Stimulation of Collagen & Elastin

Fibroblast cells in the dermis are activated to produce new collagen and elastin. This process continues for 3–6 months, strengthening the skin structure, improving elasticity, and reducing acne scar depth.

Exfoliation of Old Skin

Treated skin gradually sheds dead cells, revealing new, smoother, and more refined skin beneath.

Healing Phase

Mild redness and scabbing are expected, and the skin typically heals within 7–14 days depending on treatment intensity and aftercare. Surrounding healthy skin accelerates recovery and reduces risks such as post-inflammatory hyperpigmentation.

What Types od Acne Scars Can Fractional CO2 Laser Treat?

Fractional CO2 Laser is suitable for improving various types of acne scars, from shallow to moderately deep ones, because the laser depth and energy can be adjusted individually.

For very deep or tethered scars, subcision (cutting fibrotic bands beneath the scar) may be recommended prior to laser treatment.

A consultation with a qualified doctor is advised before undergoing the procedure.

Preparing and Aftercare for Fractional CO2 Laser

Preparing for Fractional CO2 Laser

To maximize safety and treatment effectiveness:

Inform your doctor of your medical history, especially acne medications or retinoids (important for mole-removal settings).
Allow at least 2 weeks for the skin to rest before treatment.
Avoid strong sun exposure, blood-thinning medications (e.g., aspirin), exfoliating acids, and harsh scrubs for at least 1 week beforehand.
Choose a reputable clinic with certified equipment and experienced practitioners, such as STC Clinic.

Aftercare for Fractional CO2 Laser

เTo ensure proper healing and reduce the risk of complications:

Mild swelling or irritation may occur in the first 3–5 days. Cleanse with sterile saline or clean water, and gently pat dry. Avoid harsh cleansers, hot water, and scrubbing.
Redness and scabbing may appear within 1–2 weeks. Do not pick or scratch. Use moisturizers to maintain hydration.
For mole removal treatments, take antibiotics or anti-inflammatory medications as prescribed.
Apply moisturizer and sunscreen daily, even indoors. Avoid direct sun exposure, heavy exercise, steam rooms, makeup, and exfoliating acids for at least 1–2 weeks.
If you experience unusual symptoms such as severe swelling or pus, contact your clinic immediately.