Hey healing, I have stopped the allergen all together for about 4 weeks. Also, I did not do patch testing as my doctor was pretty convinced that this was a result of an oral care product so he decided to try that first. If I had not seen improvement, then the patch testing would've begun. I initially got EC, I believe, by exposing myself to an allergen in my toothpaste/mouthwash. I was never a biter or lip licker at all.