Will eye filler increase cheek size?

Filling out your tear troughs with a thin hyaluronic acid (HA) filler such as Volbella won’t affect your cheeks at all. The filler is localized and will simply lift the skin under your eyes for a smoother, more youthful look. Be sure to consult a board-certified dermatologist who is an expert at rejuvenating the eyes with Volbella, Restylane Silk, or another thin filler.

No, tear trough filler doesn't usually increase cheek size. Under eye hollows can be permanently corrected with surgery or temporarily camouflaged with fillers (Restylane, Belotero, Volbella).
Surgery would require a fat-repositioning lower lid blepharoplasty. In this surgical procedure, fat from the eye area is moved into the tear trough depression filling the actual depression. 
I hope this helps!
 

No, well-placed filler should not increase cheek size. These fillers (Belotero, Volbella, Restylane Silk) are good for improving under the eyes, but keep in mind, a combination approach will give the most improvement. Fillers, lasers, and microneedling/PRP can improve under the eyes. My patients try to get non surgical treatments to avoid surgery. We use PRP and stem cells there often. I suggest consulting with an expert to develop a treatment plan best suited for your short and long term goals. Best, Dr. Emer