A 2026 randomized controlled study tested calcium hydroxylapatite (CaHA), an injectable filler with mineral microspheres that adds volume and supports new collagen, combined with CO2 ablative fractional laser for atrophic acne scars. The combined therapy improved all atrophic scar subtypes significantly, according to Springer Nature reporting the Chen et al. trial the 2026 Chen et al.
study. Atrophic scars sit below the surrounding skin surface. The practical idea is simple: CaHA supports the depression from beneath while the laser resurfaces texture from above.
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
- How CaHA and CO2 laser work together
- What did the 2026 study measure?
- What are the tradeoffs of CO2 laser?
- What to ask at a clinic visit
How CaHA and CO2 laser work together
CaHA uses microspheres in a carboxymethylcellulose gel. The gel gives immediate volume, then acts as a scaffold for collagen, elastin, vessels and fibroblasts, according to Merz Aesthetics UK the official Radiesse patient information. Fractional CO2 laser creates tiny ablative columns in scarred skin.
Those columns trigger collagen regeneration and remodeling. That resurfacing action keeps the laser relevant for atrophic scars. For saucerized or volume-deficient scars, the roles divide cleanly. Filler lifts the base, laser smooths the edge and surface.
What did the 2026 study measure?
The trial compared combined CaHA plus CO2 laser against laser alone. The combined-therapy group improved across all atrophic scar subtypes at p less than 0.001. Gains averaged 1.13 plus or minus 0.42 points for boxcar scars.
Rolling scars gained 0.93 plus or minus 0.47 points, with no significant difference between those two types. In plain terms, both sharp-edged boxcar scars and broad rolling depressions responded. The study did not show one type pulling ahead.
What are the tradeoffs of CO2 laser?
CO2 resurfacing carries more downtime and pigment risk than gentler options. A 2025 prospective comparative study found higher post-inflammatory hyperpigmentation with fractional CO2 laser than microneedling, 20 percent versus 4 percent, according to the Journal of Contemporary Clinical Practice the 2025 laser-versus-microneedling comparison. The same study reported downtime over 3 days in 40 percent versus 16 percent.
Pain scores also favored microneedling. That profile makes skin-type selection, sun protection, and a planned recovery window central. Darker skin needs explicit PIH precautions and clinician screening.
What to ask at a clinic visit
Radiesse received FDA approval in 2006 for moderate-to-severe facial wrinkles and folds and HIV-associated facial fat loss, a wrinkle indication rather than a specific acne-scar indication, according to the Journal of Clinical and Aesthetic Dermatology the FDA approval summary. Acne-scar use is therefore a clinician-selected application. Bring your scar types, pigment history, and calendar to the consult: Ask for a written aftercare plan with sun avoidance, gentle cleansing, and warning signs for infection or prolonged darkening.
- Which subtypes dominate: boxcar, rolling, or mixed volume loss?
- What is my PIH risk, and what pretreatment and sun plan lowers it?
- How many days of redness, swelling, or peeling should I plan for?
- What dilution, placement depth, and laser settings fit my skin?
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