A 2026 trial found combined calcium hydroxylapatite (CaHA) filler and CO2 fractional laser safely smooths atrophic acne scars. Atrophic scars are lasting dents left after inflamed acne heals, and the result gives people with them a tested combination option. Researchers ran a prospective single-center randomized controlled trial, according to the 2026 report in Aesthetic Plastic Surgery the 2026 trial report. The design tested filler injection plus ablative laser as one multimodal plan.
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 does the filler-plus-laser combination work?
- Which scars improved most?
- How does this compare with laser alone and other fillers?
- What should you expect and ask before treatment?
How does the filler-plus-laser combination work?
CaHA fillers use calcium hydroxylapatite microspheres in gel. The gel gives immediate volume, then the microspheres stimulate the patient's own collagen to thicken skin over months, according to the PMC systematic review on synthetic fillers the PMC systematic review on synthetic fillers.
CO2 fractional laser adds ablative resurfacing in tiny columns. It removes scarred surface tissue and triggers fresh repair around each column. Together, filler lifts the dent from below while laser resurfaces from above.
Which scars improved most?
Boxcar and rolling scars improved comparably in post hoc analysis, with no difference between them. Both improved significantly more than icepick scars, according to the same Aesthetic Plastic Surgery trial.
In practice, rolling and shallow boxcar depressions are the best candidates for filler-plus-laser or subcision-based plans. Deep icepick tracts respond poorly and usually need TCA CROSS or punch excision, according to the 2026 Endo One practice evaluation.
How does this compare with laser alone and other fillers?
Fractional CO2 laser alone improves moderate-to-severe atrophic scars by fractional ablative resurfacing. Reported success is limited to about 51%-70%, which motivates combination therapy, according to the April 2026 PLLA-plus-CO2 study document the April 2026 PLLA-plus-CO2 study document.
CaHA effects last about 9-15 months, according to the PMC review. Radiesse has been the only FDA-approved CaHA filler since 2006, while Bellafill is the only filler FDA-approved specifically for acne scars with up to 5-year results, according to the PMC review and a clinic comparison.
What should you expect and ask before treatment?
Expected harms include redness, pain, swelling, and crusting or scaling for 3-14 days. They can also include pigment change, acne flare, herpes reactivation, and rare scarring, according to the 2024 systematic review in the Journal of Cosmetic Dermatology the 2024 systematic review in the Journal of Cosmetic Dermatology. Ask these checks at consultation:.
- What type are my scars — rolling, boxcar, icepick, or mixed?
- Is filler-plus-laser suited to my dent depth and skin tone?
- How will we handle icepick tracts if present?
- What downtime, pigment risk, and flare plan apply to me? Bring close-up photos in different light and ask whether your pits are rolling, boxcar, or icepick before agreeing to a plan.
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