I have fat on my cheeks & jaw which make my face look round & chubby even though I'm fit. What can I do to fix this? (Photos)

Based on your photos, it appears your masseter muscle is enlarged. This often occurs to people who frequently grind or clench their teeth. The best solution for this concern is injections of Botox directly into the muscle. As the muscle relaxes, it also decreases in size to create a narrower jawline. Make sure you work with a board-certified dermatologist who has experience in this procedure, to ensure the dosing amount and needle placement create a natural result. 

Hello and thank you for the pictures.  Aesthetically, a "chubby" face is often referred to as a youthful face.  Having said that, if you're not happy with it, there are things you can do to slim your face that work well without taking fat out of your face.  I would start with botox in your masseter muscle; I'm not a big fan of Kybella as the amount of swelling and downtime is often not worth the result achieved.  I hope this helps!  Dr. Dima

Although the photos are not ideal, there appears to significant widening of the lower jawline posteriorly, (an issue more common in Asian patients) which often results from or is magnified by masseter muscle hypertrophy. If this is in fact the case here, the use of Botox (or other neuromodulators, such as Dysport, Xeomin or Juveau)) can be injected directly into the base of the muscle to diminish the muscular hypertrophy and thereby taper the lower face. Additionally, most especially in women with a wider lower face, performing nonsurgical chin augmentation with an injectable volumizing filler (buy virtue of enhancing chin projection) can further help to taper the lower face along the jawline. Make sure that you consult with a board certified aesthetic physician. Best of luck.