Unexplained recurring oral lesion

Since August I have been getting these red, basically flat and non-blistering oral lesions on my soft palate that change day to day and usually last 1-2 weeks. They seem to reoccur about once a month. I have been tested for thrush, every STD, mono, bacterial infections, other fungal infections, Celiac, and even had a biopsy which turned up as normal. I also had an allergy blood test and there was a very slight response to "milk". I have noticed that every time I get this lesion it seems to be after I have something with milk in it (like mac and cheese, or ice cream) but the number that came back on my allergy test was so low that it would normally be ignored. I also can't imagine that eating a tiny amount of ice cream (like one or two bites) could leave my mouth like this for two weeks?

The lesion is generally painless, sometimes starting out as a spot and then ending up as a red ring on my soft palate. It seems to migrate around the palate. Sometimes when it's really large or very red, it kind of feels like it's just irritated, but nothing unbearable. Also, on the days that it's the worst I also sometimes feel like I'm a bit stuffed up in my sinuses. I have no other symptoms at all. Has anyone ever experienced this or does anyone have any ideas? I have been to ENTs, an oral surgeon, dentist, primary care physician, etc. and nobody seems to know what it could be. Could it be related to the milk? Another allergy? Maybe a hormone imbalance?

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