Restylane undereye filler injection and pain around eye afterward. What could be causing this? Could there be internal bruising?

I had an Restylane filler injection in the under-eye area for both eyes the past Wed. and have been having pain in the right eye area. I did not have any bruising except for a little puffiness the day after. Now from the outside I can't tell any problem except that when I blink, the muscles/skin around the right eye hurts (esp. around the outer corner and the lower eyelid). I had a total of 1ml injection and I'm fine otherwise. What could be causing this? Could there be internal bruising! Thanks!