The 2026 split-face trial tested transdermal poly-L-lactic acid (PLLA) with fractional microneedle radiofrequency for atrophic, or depressed, acne scars. In Fitzpatrick types III–V, the PLLA side improved more at six months, so comparison turns on results, pigment safety, and operator skill.
Split-face means one side of the face gets the active treatment and the other side serves as control. Fitzpatrick types describe how skin responds to sun, with III–V covering medium to brown skin that can develop dark marks after injury. The trial focus was texture and scar volume, not a full guide to healing for every skin type.
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 the 2026 PLLA trial tested
- How microneedling compares with peels
- How to lower pigment and injury risk
- Who needs extra caution
What the 2026 PLLA trial tested
According to Springer Nature, researchers studied Asian adults with moderate-to-severe atrophic scars in Fitzpatrick III–V using PLLA delivered by fractional microneedle radiofrequency the Dermatology and Therapy report. Microneedle radiofrequency uses tiny needles plus heat energy to reach the dermis. Transdermal PLLA means the PLLA solution is applied to aid skin remodeling after needling.
The PLLA sides showed greater texture and scar-volume improvement than control sides at six-month follow-up. More patients reported at least 75% improvement on the PLLA side. The design allows direct left-right comparison in the same person, which reduces differences due to age, sun habits, or healing.
How microneedling compares with peels
According to Rutgers University, a trial assigned 60 acne-scar patients with Fitzpatrick IV–VI to microneedling or 35% glycolic-acid peels every two weeks for 12 weeks the Rutgers announcement. Seventy-three percent of microneedling patients improved by two or more points on Goodman-Baron grading, versus 33% of peel patients. Goodman-Baron grading is a scar-severity scale, with larger point drops meaning visible smoothing.
Senior author Babar Rao concluded that patients whose darker skin rules out stronger peels should use microneedling. Stronger peels can permanently discolor darker skin, while lighter-skin patients may still consider peels. For brown skin, the pigment cost of a peel can outweigh its scar benefit.
How to lower pigment and injury risk
According to Harvard Health Publishing, lasers, chemical peels, and microdermabrasion for darker skin should be done by a board-certified dermatologist experienced with darker skin Harvard guidance on acne in darker skin. Incorrect treatment can worsen scarring and post-inflammatory hyperpigmentation, or dark marks after inflammation. Skill with darker skin is part of safety, not an extra.
The FDA warns that professional microneedling needles can reach nerves and vessels and urges treatment by trained professionals. Some acne-scar clearances cover only Fitzpatrick I–III, so people with brown skin should ask whether the device is cleared for their type. Age limits, device type, and aftercare also affect eligibility.
- Ask for experience with Fitzpatrick IV–VI and acne scars
- Ask whether the device is cleared for your skin type and age group
- Plan sun protection and small-area testing when heat, peel, or laser is proposed
Who needs extra caution
The 2026 PLLA results apply to Asian adults in types III–V with short follow-up. They do not establish equal recovery or pigment risk for type VI skin, keloid-prone patients, or active acne. Keloid-prone skin can form raised scars after injury, and active acne raises infection and marking risk.
According to the American Academy of Family Physicians, pigment protection for skin of color includes testing laser on a small area first, avoiding excess sun, and using broad-spectrum sunscreen before and after treatment the AAFP review on skin of color. Broad-spectrum means protection against UVA and UVB rays. Bring your scar history, keloid history, active breakouts, and current retinoid or acid use to the visit.
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