Why have my cheeks become bigger? What has caused it to become so?

Patients with questions and concerns of face /cheep puffiness should ideally post a picture of the face to determine the exact location of the problem, so recommendations could be given. 

Buccal fat excision is an appropriate surgical procedure for patients that of overly full and wide cheek areas. In common terms, it is good for patients who have chipmunk cheeks. Without pictures, is difficult to tell if you're a good candidate. You are a patient that would need an in person consultation for a complete evaluation and explanation of the positives and negatives of this procedure in your situation. I hope this helps.