Lower Eyelid Drooping After Blepharoplasty, How Long Should I Wait to Fix it?

Please wait at least 3 months...preferably even longer. I sometimes recommend waiting up to a year after the initial surgery. Now if it is a severe problem, and it has obviously stopped improving, then 3 months would be the minimum amount of time.

In addition,  there are other treatment options while the scar is softening:  steroid or 5FU injections to help soften scar, or injection of hyaluronic fillers to help stretch tissue and temporarily improve eyelid position.

See your Doctor again and inquire about these options.

Revision Surgery

Revision eyelid surgery should be done at least 6 months
after the initial surgery to allow time for healing and tissues to soften. Asymmetries, excess skin, fat rolls, fat malposition can all be improved. Other treatments may include laser or
chemical peels to tighten skin and improve texture

It sounds like you have what is called ectropion ("ek tro pea yon").  This is an abnormal position of the lower lid where the lid is furrowed outwardly.  This can be due to scarring and/or swelling.  Certain patient can be identified prior to surgery by testing how lax the lower lid is by pulling on it.  In your case I would wait to see if the position improves as the swelling subsides over a three month period.  If present after that time then some surgeons would use a steroid injection to try to soften scar tissue in hopes the eyelid would return to its normal position.  If that does not correct the issue then a surgery to tighten the lower eyelid may be necessary (canthoplasty).

Dr. ES

This problem must be approached individually.  Treatment depends on the degree of eyelid malposition, whether or not there is lagophthalmos, what symptoms you are having, what the trend is over time, how bad it looks, and how you feel about it.  Tarsorrhaphy, suggested as a possibility by your surgeon, is a good temporary solution.  Corticosteroid injections, massage, and surgical revision (usually a minor office procedure) are other treatments.  Sometimes, spontaneously resolves as orbicularis tone recovers and edema (swelling) resolve.

You did not provide us a photograph.  There is more than one thing that can go awry with lower eyelid surgery.  "Putting a stitch in the eyelid" seldom corrects the problem.  It is understandable that the surgeon wants to take care of this issue as rapidly as possible for you.  However, it does not benefit you to have a fix that does not really help.  I agree that a second opinion is a good idea.  If you want to maintain your relationship with your surgeon, consider having them arrange  a second opinion with an oculoplastic surgeon they work with.  Generally it is best if you allow the eyelid to heal for an extended period of time.  This allows for a more precise correction.  Also some issue do settle down with a little time.  Please consider reposting your questions with photographs.