Upper eyelid surgery is a very common cosmetic surgical procedure. Excess sagging skin develops with age in the upper eyelid contributing to an aged appearance. Upper lid bleparoplasty may be performed under local anesthesia, IV sedation (twilight), or general anesthesia depending on your preference, and/or if are having additional procedures.
Although subtle variations exist, generally upper eyelid surgery primarily removes a little strip of skin with or without fat & muscle. You can estimate how much skin the plastic surgeon may remove by pinching the excess skin yourself. The wound is closed with absorbable sutures that don't need to be removed.
Bruising & swelling is generally just in the upper eyelid & brow area, but may extend to the lower eyelids too from gravity. Recovery is within a few day to a weeks, with maximum cosmetic benefit by one to two months.
A droopy or descended eyebrow will also contribute to excess upper eyelid tissue. Some patients with low brows would better benefit from a forehead lid than plastic surgery of the eyelid. Speak with a plastic surgeon who specializes in eyelid surgery to see if blepharoplasty and/or brow surgery is appropriate for you. Best of luck.