The 2026 evidence for calcium hydroxylapatite (CaHA) with CO2 laser for atrophic acne scars rests on one 160-person randomized trial. That sample shows benefit for depressed scars, but single-center design and Level of Evidence II limit how far the results apply.
CaHA is an injectable filler that adds volume and supports new collagen. The Springer Nature Aesthetic Plastic Surgery team tested CaHA injection plus CO2 ablative fractional laser against laser-centered control care in the 2026 randomized trial report. The combination helped boxcar and rolling scars and aided recovery after laser.
Medical information disclaimer: This article is for general educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a physician or other qualified health professional about symptoms, medications, tests, or treatment decisions.
Table of Contents
- What does the CaHA-plus-laser treatment do?
- Why do 160 patients at one clinic limit the proof?
- Which scar types respond best?
- What should you ask before booking?
What does the CaHA-plus-laser treatment do?
CaHA contains calcium hydroxylapatite microspheres in carboxymethylcellulose gel. The PubMed narrative review describes immediate volume plus a scaffold that supports collagen, elastin, vasculature and fibroblasts.
In the trial, CaHA injection was paired with CO2 ablative fractional laser for atrophic scars. The trial team reported the pairing as effective and safe, with reduced laser-related adverse events and stronger scar remodeling.
Why do 160 patients at one clinic limit the proof?
All 160 people were treated at one clinic, Dexi medical aesthetic clinic Deyi Skin. Single-center care brings single-center bias because technique, skin-type mix and aftercare reflect one setting.
The journal labels the article Level of Evidence II. That means a small randomized trial, not large multicenter evidence for people with atrophic scars.
Which scar types respond best?
Rolling and boxcar scars saw the clearest improvement with CaHA plus ablative fractional laser. The trial reported optimal improvement for boxcar and rolling atrophic subtypes.
Expectations should shift by shape. Rolling and superficial boxcar scars respond best to fractional laser-based treatment, while pitted and icepick scars respond least, according to the Journal of Cutaneous and Aesthetic Surgery in this fractional CO2 scar-type analysis. Icepick-dominant patients should expect less benefit.
What should you ask before booking?
Fractional CO2 laser often brings transient erythema, edema and post-inflammatory hyperpigmentation that resolve within weeks. A 2025 systematic review of seven studies found 30%-70% scar improvement with those short-term harms, according to MDPI Life in this 2025 fractional CO2 systematic review. Use the evidence gap to guide the consult: Bring close-up photos of your scars in the same light and ask for a subtype-by-subtype plan.
- Ask which subtype dominates your scars: rolling, boxcar or icepick.
- Ask how many combined CaHA-plus-laser cases the clinic has treated.
- Ask what recovery support and pigment-risk plan they use for your skin type.
- Ask what result would count as success for your scar pattern.
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