Possible Sinus Infection, should I see a doctor?

Warning this is kinda gross.

Recently I've noticed a large hole/line with white stuff my mouth. It isn't bleeding and doesn't hurt and it's right next to where the holes in your mouth are to breath through your nose. So usually there are these things that I guess control sinuses on the far left and right side bear these holes. On one side i have what feels like a hole and there is no normal thing that should be there (I have one on one else but a huge hole/line on the other). I've noticed this hole many times before but more so recently. White stuff has been stuck in there and I've had the taste of rotting meat. Sometimes I think it's food but other times there is no taste and it's just this white stuff. I'm pretty sure this hole was caused by food getting stuck and then bacteria eating it away? It's really gross and I've put my finger back there and the pretty big and I think its spreading. I'm kinda concerned the more I think about it and am thinking of going to a clinic since an ENT is not available in such short notice. I assume this is a sinus infection or was one that caused this but I am not sure what to do now.