I've discovered I have to avoid foods with oxalates....like spinach and kale. Also, all the acidic foods, pineapple, oranges, cranberries, cherries, raspberries, tomatoes, soy (it's in everything....it's a ''filler''), pecans, walnuts, brazil nuts, almonds (I can eat almonds if the skin is removed), white potatoes (I remove the skin and I can eat them), chocolate (bummer), cereal (it's the bran that's the problem), dried fruit (sulphates), all peppers including the green, red, orange and yellow (due to capsaicin). So, pay attention to ingredients as there are so many that say ''we're healthy, we have such and such ingredients that's the best for you''. Pay attention to your mouth and lips, they let you know when something doesn't feel right, or the mouth and lips are burning. Maybe keep a food diary, with notes about sores in mouth and on the lips and see if you can make a correlation. I know it's annoying to have banned foods, like CHOCOLATE, but for me it's worth it to not have the burning pain, and blisters. Hang in there, OLPers!