What is this bump under the skin on the roof of my mouth? Redness on back of palate aswell

large lynphnode like bump or swelling on the left side of my palate where my gum meets my palate. its diffucult to see but i can feel it and its rather large. on the right side of the photo its mirrored) you can see a raised swelling. there is also redness on the back of my mouth . its painless and wont go away. max sinus above it seems to have thickened walls.