Can facial asymmetry be caused by favouring one side of the face?

I have facial asymmetry, which is normal, however I feel mine is very pronounced. The left side of my face is muscular and developed with my cheekbones protruding and good muscle definition. However, it seems as if the right side of my face is lacking muscle or tissue, it seems to be 'saggy' along my jawline with the right corner of my lips dragging down. The right seems to be underdeveloped in general. Could it be caused by chewing on my left side/using it more? What are my treatment options?

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