Right side of my face is swollen

The right side of my face is swollen. The swellness is over my nasolabial fold, the lower lip and the lower cheek, and a little under my eye. I don't know the cause. I've made a tomography without contrast and they didn't find nothing. I have postnasal drip on my right nostril and my tongue is always white. I suspect from some kind of fungus, but I don't know which kind of test should I ask for. I'm tired of not getting and answers and doctors see it but do nothing to help me. What could it be? If it was a fungus, should it have been detected with the tomography?

So a CT is a 3D image of internal structures of a solid object (such as the human body) which would NOT test for any kind of fungus or bacteria. Is your tongue normally very white? Do you use a tongue scraper every time you brush your teeth? If not, I would suggest getting one and use it every single time you brush to get rid of excess bacteria that may be on your tongue. What exactly makes you suspect that it is a fungus? Have your doctors mentioned that it could be a fungus?