Incidence and treatment of delayed‐onset nodules after VYC filler injections to 2139 patients at a single Canadian clinic

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Abstract
Background: Data suggest that hyaluronic acid (HA) fillers using VYC technology have a higher incidence of delayed‐onset nodule development at facial injection sites than earlier HA products.Objective: To assess the incidence of delayed‐onset nodules with VYC products based on a single experienced injector.Methods and Materials: Patients with delayed‐onset nodules after injections with VYC‐20L, VYC‐17.5L, and VYC‐15L were identified by retrospective chart review.Results: Since 2010, 2139 patients received injections from the same physician with combinations of VYC‐20L (57.6% of patients; 2.4 syringes/patient), VYC‐17.5L (23.9%; 1.5), or VYC‐15L (18.5%; 1.5). Seven female patients (mean age, 62 years) developed delayed‐onset nodules for an overall incidence of 0.33%. A potential inflammatory trigger (reported by 6 patients) occurred 1–168 days prior to nodule development. Nodule biopsy in 1 patient confirmed a foreign‐body granuloma. The most effective treatment incorporated prednisone with or without hyaluronidase, and in 2 patients, nodules resolved spontaneously. The incidence of delayed‐onset nodules was not associated with injection technique or amount of product used.Conclusion: VYC‐associated incidence of delayed‐onset nodules (0.33%) was lower than earlier estimates from previous studies. In the current analysis, VYC‐15L had a rate of delayed reactions comparable with non‐VYC products.

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