Hmm interesting that you mention that you have a weak immune system. So do I. I always used to get cold sores, canker sores, colds, flu, crazy high fevers. In fact, now that I think about it, EC developed sometime after I had some weird persistent fever for almost 2 weeks, and I think I was prescribed some strong Antibiotics . But I cannot for the life of me remember exactly when I noticed EC. Have you had blood work done and if so what was your Absolute Neutrophil count at? Mines at about 1.1 on a scale of 1.8-7.8. So I guess that's considered mild to moderate Neutropenia. I'm beginning to realize that part of the reason why my EC isn't healing is because the Nystatin doesn't penetrate well and my body can't naturally fight it off.