The fractional CO2 laser has revolutionized scar treatment in recent decades. Below are the answers to the most frequently asked questions about this technology, based on scientific evidence and clinical practice.

What is fractional CO2 laser?

Fractional CO2 laser is a technology that emits light beams in micro-points on the skin, creating treatment zones interspersed with intact tissue. This stimulates new collagen production and remodels scar tissue, improving scar texture, color, and depth.

The "fractional" concept means that the laser does not hit 100% of the surface, but rather a fraction – generally between 15% and 40% of the area per session. The intact zones function as a reservoir of healthy cells that accelerate recovery. The CO2 wavelength (10,600nm) has great affinity for water in tissues, allowing for precise vaporization.

Does CO2 laser work for acne scars?

Yes, fractional CO2 laser is considered the gold standard for treating atrophic acne scars. Studies show 50% to 75% improvement in scar appearance after a series of sessions, especially for boxcar and rolling type scars.

Acne scars are classified as icepick, boxcar, and rolling. The CO2 laser is most effective for boxcar and rolling. For icepick, it is often combined with subcision or punch excision. The treatment requires 3-5 sessions with intervals of 4-6 weeks. Improvement continues for up to 6 months after each session.

Is CO2 laser very painful?

The procedure is performed with topical anesthesia applied 30-60 minutes before, making discomfort very tolerable. Most patients describe it as a sensation of warmth and mild stinging. After the procedure, there is redness and burning for 24-48 hours.

The intensity of discomfort depends on the parameters used. For more superficial sessions, topical anesthesia is sufficient. For deeper treatments, local anesthetic block or mild sedation may be opted for. Initial recovery lasts 3-7 days, and the skin may remain pink for 2-4 weeks.

How many CO2 laser sessions are needed?

On average, 3 to 5 fractional CO2 laser sessions for scars, with intervals of 30 to 45 days between them. The exact number depends on the depth and extent of the scars and the individual response of each patient.

Each session produces an incremental improvement of 15-25%. Results are cumulative and continue to improve between sessions. More superficial scars may require 2-3 sessions. Deep scars may require 5 or more. Annual maintenance may be recommended.

What are the post-CO2 laser care instructions?

Avoid sun for 30 days, use SPF 50+ sunscreen, keep skin hydrated with prescribed products, do not pick scabs, avoid makeup for 5-7 days, and avoid intense physical activity for 1 week.

In the first 3-5 days, the skin will be reddish with microcrusts – wash gently with saline solution and apply prescribed healing ointment. Flaking is normal. Avoid acids and retinoids for 30 days. Premature sun exposure can cause permanent hyperpigmentation.

Is CO2 laser suitable for surgical scars?

Yes, fractional CO2 laser is indicated to improve surgical scars – both aesthetic (abdominoplasty, mammoplasty) and traumatic. It improves texture, color, and overall appearance.

For surgical scars, CO2 laser is most indicated when the scar is mature (at least 6-12 months after surgery). It can be combined with subcision and corticosteroid infiltration. It is especially useful for burn scars.