I had buccal fat removal 10 days ago. I had really hard lump in my right cheekbone. It will go away with time? (photo)

It is common to have swelling that may be quite firm or full after this procedure.  That said, it's important to discuss the matter with your surgeon to ensure that there is nothing problematic happening.  It is important that you seek the advice of a surgeon who is certified by the American Board of Plastic Surgery and who has extensive experience with buccal fat reduction surgery.  
I wish you the best! 
Dr. Gabbay.

Swelling is an expected finding after buccal fat removal. In some patients the swelling is more in one side of the face than int he other. Most of the swelling goes away in few days. However, in some patients swelling could last more than a week.Patients with questions and concerns about their buccal fat removal healing process should address those concerns with the surgeon that performed the operation, ideally during a follow up consultation.

Swelling is typical after buccal fat removal and can be asymmetrical. The swelling is typically moderate and will slowly resolve over a few weeks. If you have questions about after care, I suggest following up with your Doctor. I hope this helps.