Long-Term Tissue Response to Hyaluronic Acid Fillers: Fibrosis, Inflammation, and Delayed Complications
DOI:
https://doi.org/10.61424/tkx3xh97Keywords:
Hyaluronic acid filler, dermal filler complications, delayed inflammatory reaction, foreign-body granuloma, fibrosis, long-term tissue response, hyaluronidaseAbstract
Hyaluronic acid (HA) dermal fillers are widely used for non-surgical facial rejuvenation. However, emerging evidence challenges their presumed complete biodegradability and temporary nature, revealing instead the potential for long-term tissue reactions, including fibrosis chronic inflammation, and delayed complications. These complications, which may manifest several months to years after injection, are driven by complex immune-mediated mechanisms and remain understudied in diverse U.S. populations. The objectives are to report clinical manifestations, histopathology and radiologic correlates, management approach and outcomes of delayed HA filler complications in a multicultural cohort of the United States with a primary focus on fibrosis and inflammation processes. This retrospective case series was a single-center study of 15 consecutive cases of patients with delayed complications (>4 weeks after injection) in an academic aesthetic dermatology clinic during the period of January 2020 to December 2025. Electronic health records were reviewed and provided the data demographics, filler details, complication progression, clinical photographs, high-frequency ultrasound results, histopathology (hematoxylin-eosin, Alcian blue, immunohistochemistry), treatments, and 6 and 12 months outcomes. Variables were summarized using descriptive statistics based on STROBE and CARE guidelines. Complications were first experienced by the cohort (86.7% female; mean age 41.2 ± 7.5 years; 40% Caucasian, 33.3% African-American) after a mean of 10.8 ± 8.2 months after injection. Fibrotic induration was the leading (73.3%), then inflammatory nodules (66.7%), persistent edema (40%), and migration (13.3%). Infections (26.7%) and vaccinations (13.3%) were identified as triggers in some cases. Ultrasound showed hypoechoic deposits with fibrotic halos. Histopathology revealed foreign-body granulomas expressing TGF-β and containing multinucleated giant cells. Treatment with ultrasound-guided hyaluronidase (mean 2.1 sessions), most commonly combined with intralesional triamcinolone, resulted in complete resolution in 80% of cases at 6 months, with no recurrences observed at 12 months. In this series in the U.S., our findings suggest that responses to HA fillers may involve fibrosis and inflammatory responses associated with persistent remnants and immune stimuli. Early interventions guided by imaging provide positive results, making it essential to step up surveillance and risk classification in heterogeneous groups of patients and biomarker-based prevention to maximize the safety of aesthetic medicine.
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