Each eye can take different amounts of time to heal. Blepharoplasty and eyelifts are essentially two different surgeries one on the right and one on the left. Just like you are asymmetric on both sides. Your anatomy is also not totally symmetric easier and that pertains to blood flow. It is possible that your blood vessel anatomy is different from each side and that there may be more vessels stimulated on the side that is more swollen. Also when sleeping you could have spent more time on the side that is swollen and fluid might have accumulated there more. Don’t worry things will start evening out. I wouldn’t consider anything rash for a couple of months after eyelid lifting / eye lift / blepharoplasty surgery.
Dr Young is located in Bellevue near Seattle, Washington