Multiple oral granulomatous nodules to hyaluronic acid filler.

A 74-year-old Caucasian woman presented with a 2-week history of multiple nodules in both lips and perioral region that caused her mild discomfort while eating. The patient reported hyaluronic acid infiltration on both lips 5 months prior to presentation. The examination revealed multiple, well-defined, millimetric, and firm nodules on both lips and oral mucosa. An excisional biopsy of one of the nodules was performed under local anesthesia. Histopathological analysis demonstrated acute eosinophilic inflammation, fibrosis, and granulomas on mucoid material, positive for colloidal iron stain and Alcian blue stain, alongside a minor salivary gland showed mild atrophy, fibrosis, and fat infiltration. Enhancement of the aged lip using hyaluronic acid, to restore the bulkiness and elasticity that have been lost with age, is very common. Nevertheless, soft tissue fillers are used in a wide age range. Hyaluronic acid represents 78% of the dermal filler injections in the United States, been the second most popular nonsurgical cosmetic procedure after botulinum toxin injection. Foreign body granulomatous reaction is a rare delayed complication that has been well documented elsewhere and it has been associated with poor injection technique. Although it also has been related to hypersensitivity reactions that may be caused by impurities developed during the bacterial fermentation process, treatment of granulomatous reactions with hyaluronidase is recommended.