After attempting buccal fat removal, I had an abscess in my left cheek (right in photo) and had to be drained. (Photo)

Infection is the number 1 risk of buccal fat removal or any other plastic surgery procedure. 
When an abscess forms in the cheeks, the gold standard treatment is drainage of it. 
Swelling of the cheeks post abscess drainage could last for at least 6 months. Therefore, the face may look asymmetric until then. Thus, it is no recommended to undergo any other cheek procedure (eg fat transfer) to achieve a more symmetric face until the swelling has been resolved.
Patients who are not completely satisfied with buccal fat removal are usually in their 30s and above, have not good cheek bones, and their cheek bones were not enhanced before or at the time of the buccal fat removal. High cheek bones are the key to have a great buccal fat removal result. 

Dear rf198523,I would wait at least 6 months before making a decision on what to doIt might be easier to just fill the left side, but an in-person consultation would help so you can discuss your goals after an examBest,Dr. Nima