Can a 15 year old girl have a buccal fat pad removal with both her parent's consent?

Buccal fat removal ideally should be done in patients that have completed their normal growth. Performing the surgery while the body is still growing could affect the shape of the face in a way that might not be predictable. 

Thanks for your question. While technically your parents could consent to the procedure on your behalf, I wouldn't recommend it at such a young age. The body is still growing and changing at 15. As you age, your face may thin naturally, and removing that fat might make you look worse when you are older.  I advise meeting with a board certified Plastic Surgeon with your parents present to discuss your concerns. 

I would not be willing to perform buccal fat pad removal for you until you turn 18.  Because removal of cheek fat is irreversible, it requires a serious commitment, which only you--and not your parents--should make.