Everything is already inflamed, today I discovered a small white-beige…

Everything is already inflamed, today I discovered a small white-beige spot on the gums where the molars are, it looks like a rough patch (like a plaque), only in one place. I have read everything online, but I'm going to see a doctor on Thursday, I can't take a picture, I can't open my mouth, and I can't talk to anyone, I will go crazy before the appointment. We have white spots on our gums, but I think they are from milk, maybe stomatitis on the gum, but there is only one spot.