FSRB, I know of no contraindications to injectables and seasonal allergies. By the way, try eating local honey; good evidence it helps airborn local allergies.
To ensure you receive optimal results it is
recommended to wait until your allergies have subsided. If at all possible,
taking Claritin, Allegra, or even Patanol then waiting about a month will help
resolve any allergies. It is pertinent to take care of any allergy issues prior
to injections so that it does not affect the results or outcome.
If you are suffering from seasonal allergies it can definitely affect how "swollen" you appear in the under eye area. I would wait until the allergies are controlled before I had this sensitive area injected.
The allergies would not prevent you from having Restylane. Are you able to control them with Claritin or other medication? If they produce a running nose and red eyes, then it would be wise to wait until these symptoms have subsided.
The Restylane won 't hurt your allergies but I would would wait because I would rather not have my patients rubbing their eyes after injection and you won't know where your swelling is coming from if you swell. Also, if you have swelling it will take longer to resolve if rubbing.