The fractional CO2 laser has revolutionized scar treatment in recent decades. Below are the answers to the most frequent 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 the production of new collagen and remodels scar tissue, improving the texture, color, and depth of scars.

The term "fractional" means that the laser does not treat 100% of the surface, but rather a fraction — usually between 15% and 40% of the area per session. The intact zones act as a reservoir of healthy cells that accelerate recovery. The CO2 wavelength (10,600nm) has a high 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 the appearance of scars after a series of sessions, especially for boxcar and rolling scars.

Acne scars are classified as icepick, boxcar, and rolling. CO2 laser is most effective for boxcar and rolling. For icepick, it is often combined with subcision or punch excision. Treatment requires 3-5 sessions at 4-6 week intervals. 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 an option. 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 sessions of fractional CO2 laser 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 patient's response.

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

For the first 3-5 days, the skin will be reddish with micro-crusts — gently wash with saline solution and apply prescribed healing ointment. Peeling 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.