Drooping After Fat Grafting on Hollow Upper Eyelid

After six months, patients have usually reached their stable plateau and it is time to assess the final results.
You may wish to go back to your original surgeon and get their opinion on what is going on.
No doubt they will assess the upper eyelid opening muscle (levator), preoperative eyelid position, and assess for scar tissue formation, dynamic function of the upper eyelids, brow position, orbital set (how prominent the eyeball is), lower eyelid position, etc.
If an excess of fat has survived on one side, it may be possible to debulk this very carefully, avoiding injury to the levator muscle and its nerve supply.
In our practice, we prefer single nontraumatized fascial fat grafts for the purpose of reducing upper eyelid hollowness. these grafts are placed in a predictable place and could theoretically be modified fairly easily, although this has not been necessary.

Predicting fat graft survival is similar to predicting how many seeds will sprout when planting. In order to get one plant, you typically place 2-3 seeds per site.
Same goes for fat grafting, we oftentimes "plant" 2-3 times the final desired amount anticipating that some will not survive.
Occasionally more survives than we would like and we need to remove this.
At this point, your fat has likely survived, perhaps in excess of the desired amount. Consider discussing this with your surgeon.

The upper eyelid may droop a little bit after fat grafting secondary to swelling. This may take several months to improve.