How long does chemosis last? I had a blepharoplasty on 12/20/17.

It can be a complicated problem that requires examination and more information to determine what the best treatment would be.

Chemosis can occur after a lower eyelid surgery.  IT usually resolves within several days to weeks.  So at 7 months it should be gone.  If the lower eyelid is too low, the chemosis may persist.  You may also have something called conjunctivochalasis which is loose, redundant conjunctiva.  This can be more pronounced after a lower lid surgery, and may cause tearing and can sometimes swell.  There are ways to help with these issues.  See an oculoplastic surgeon for help with deciding what you can do to improve the situation.