Hard to call without a history and full examination. It can possibly be filler. If you had no swelling for several days then sudden swelling, other causes such as cross antigen reactions, hypersensitivity (delayed) and others need to be excluded. Was the product on bone ? What was the technique- needle vs a canular etc....etc... the best answer will come from the Specialist that performed this procedure on you. If someone can inject, they will have all the expertise and know how to deal with potential outcomes and complications. All the best, Dr Davin Lim