What warning signs should I watch for after Juvederm injection?

Thank you for sharing your case.  You are correct, Juvederm is not a good option for treating wrinkles in the glabella.  It sounds like you are ok right now, but there are definitely cases of blindness and skin necrosis in that area.  

Any warning signs typically reveal themselves within the first 24 hours (pain, numbness, skin discoloration), so it sounds as if you are in the clear. In the future, it would probably be best to stick with Botox for that area of the face. Best, Dr. Nazarian

You are correct that the injection of fillers in the region between the eyebrows can be potentially harmful. Fortunately, you are probably safe at one day post injection. It is safer to avoid fillers in this area, but Botox can be used safely. Good luck.

Juvederm in the glabellar area do carry risks of bleeding, pain, and vision loss as it can cause intravascular occlusion of a neurovascular bundle located in this area between the eyebrows.  Not all professionals recommend this due to its risks.

Thank you for your question.  At this point if anything were to happen it would have already happened.  For your education signs of intravascular occlusion with filler would include duskiness to the area, pain, blanching, and/or vision changes.  Regards, Dr. Matt Elias