I get this reaction to certain meds or herbals. Like vitimans. This just began a few years ago, never did anything bother me before. Maybe your having a reaction to something? I would ask a Dr. and have it checked out though.
I definately found some information. Well, it depends on what kind of medication you are on. I am taking Niaspan for cholestoral and these are the side effects of it. When your body have enough of these vitamins, it flushes out of body like this. It is advised by proffessionals to take an aspirin half an hour before taking Niaspan to avoid this flush. In my case, I simply stopped taking Niaspan and seek alternative from my doctor. It is always good to see doctor in such cases. I hope this is helpful to you.
I've had this same reaction 3 different times! I have on occasion, also vomited. I ran to my doctors while I still had the rash very early in the am during one outbreak (I knew that the rash would disappear very quickly). I was told that they thought that it was a winter virus. I still have no idea what that actually is but, the outbreaks are AWFUL! During the last nighttime outbreak I was so uncomfortable that I had to take my pj's off. If you get any further info on this please let me know. Thanks