Could Dysport, Restylane or Juvederm cause uncontrollable sneezing and awful sinus issues in a first time user?

Thank you for your question. It is highly unlikely that your sneezing and congestion are related to your injections. Given that you live in St Louis and that fall has just started the pollen count is now high and this is a much more likely cause of your symptoms. I would consult with he doctor who manages your allergies about this .

Thank you for your question.  It is unlikely that you are having an allergic reaction to the products. These products are not injected into the sinuses.  Consult your allergist to see if there's something in your environment that is causing these symptoms.