Thanks for choosing health care magic for posting your query. You have not mentioned you current age.
From the description that you have given, considering that you are an adult and that the injury
had occurred years back, it is highly unlikely that the trauma that you are mentioning is responsible for your puffy face. There could be various other reasons. You should get your blood checked for CBC and renal function test. You can be assured that it is not related to the trauma.
Hope I am able to solve your concerns.
If you need any further help in detail, I will be more than happy to help you.
Wish you good health.
Dr. Pooja Reddy MD