Thank you for getting in touch with us. Well. We still don't know the real reason.
But I have a personal theory: There are a lot of chinese and traditional medications that "boost" the immune system. The problem with most of these patients are that their immune system is hyperactive to start with.
For example: Eczema and nasal allergies, are conditions where by the immune system attacks harmless things like dust. What do you think happens when you boost these patient's immune system? I leave it up to your imagination.
Dr Paul Ang Teng Soon