Thanks for writing to us.
Swelling on face may be due to-re-infection of the fractured area/traumatic injury/sinus infection
Decay or bone loss of teeth also can cause such swelling.
I would suggest you to visit a oral-maxillofacial surgeon and get clinical as well as OPG radiograph examination done.
If required,bone plating along with screws has to be replaced.
if present ,has to be drained well.
Take complete course of antibiotics too.
The jaws has to be immobilized for a while .