Hi, I Am Having Difficulty Swallowing. My Palatoglossal Arch Has

Hi, I am having difficulty swallowing. My palatoglossal arch has what looks like an ulcer on both left and right side. It is red and very sore.
I get this every month or so.... However last time I had it was 2 weeks ago and it cleared up but is now back again.
My glands on neck aren't swollen and when looking down throat tonsils are fine.