Why does one side of my face appear to be underdeveloped, droopy and crooked? (photos)

I have been noticing for 6 or 7 months now that the right side of my face appears to be a little underdeveloped and droopy. It is literally a bit lower than the left side. When I feel my face, I can tell that the bony structure of the right side of my face is a bit lower. That is why my face appears to be droopy and underdeveloped. Why does this happen? Do I have a deadly disease or something like that? Please someone help me. This is making me insane.

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