Introduction: Fractional radiofrequency (RF) technology has been shown to be a gold standard therapy for acne scars. We have previously published clinical and histological results from the treatment of 8 patients with active acne and acne related scarring using a fractional RF device. Evidence of safety and efficacy was demonstrated, including long term follow-up clinical results from 4 patients, up to two years post last fractional treatment. In the current article we present histology evidence of acne scar skin renewal 3.5 years post treatment. Methods: Skin biopsies from acne scars in a concealed facial area were taken before, after four treatments and at 3.5 years after the last fractional treatment. Biopsies were examined with standard hematoxylin and eosin (H&E) stain, as well as Verhoeff’s Van Gieson (VVG) and Shikata stains for elastic fibers. Results: Histological findings demonstrate regeneration of elastic fibers and reduction of the dermal fibrosis. Scar depth of Patient #2 was reduced by 80% in the corresponding follow-up period. Conclusion: The long-term histological results further support the previously published findings that fractional RF is a safe and effective treatment for acne related scars.
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