Complications of Hyaluronic Acid and Calcium Hydroxylapatite Fillers—A Comprehensive Narrative Review of Clinical Presentation and Current Management Strategies
Natalia Sukmanskaya, Sebastian Cotofana, Michael AlfertshoferABSTRACT
Background
Hyaluronic acid (HA) and calcium hydroxylapatite (CaHA) fillers are among the most widely used injectable materials in aesthetic medicine. Although both exhibit favorable safety profiles, concomitant with increasing use comes a broader spectrum of reported complications, ranging from mild, self‐limited reactions to rare but potentially dramatic events.
Objective
To provide a comprehensive narrative review of the clinical presentation and current evidence‐based management strategies for common and uncommon complications associated with HA and CaHA fillers.
Methods
A narrative review of the dermatologic, plastic surgery, ophthalmologic, and aesthetic medicine literature was conducted, focusing on peer‐reviewed studies, systematic reviews, expert consensus statements, and illustrative case reports addressing complications of HA and CaHA fillers. Complications were categorized by timing, pathophysiology, and clinical severity, and management approaches were synthesized accordingly. Relevant English‐language articles were identified through PubMed/MEDLINE and Scopus up to 2025 using combinations of the different search terms supplemented by hand‐searching of reference lists; evidence was weighted qualitatively, giving precedence to consensus statements and larger studies over individual case reports.
Results
HA and CaHA fillers share overlapping complication profiles, including bruising, swelling, vascular occlusion, infection, nodules, granulomas, and delayed inflammatory reactions. Key differences arise from their inherent product properties: HA complications benefit from enzymatic reversibility with hyaluronidase, which underpins established treatment algorithms for vascular occlusion, Tyndall effect, chronic edema, and nodules. In contrast, CaHA‐related complications rely more heavily on prevention, supportive care, and, in select cases, mechanical removal through surgical intervention, as no enzymatic reversal is available. Early recognition and prompt intervention are critical determinants of outcome, particularly in ischemia‐related complications.
Conclusion
HA and CaHA fillers are effective and generally safe filler materials, yet not without risk. A thorough understanding of complication patterns, material‐specific management strategies, and preventive techniques is essential for clinicians performing filler injections. With appropriate training, education, and safety algorithms to manage adverse events, most complications can be treated effectively, thereby maximizing patient safety and satisfaction.