I get the same thing, I have had this for quite a few years and happens on and off and also is intensified usually when I drink alcohol... or alcohol is a trigger. In fact, I initially only would get it when I would drink or if I was super stressed and then that changed over time as I haven't drank this whole time on NB. If it happens, it usually happens in the afternoon or early evening for me and is a sort of flushed feeling. I think it may have something to do with the liver or something to do with heat rising but I am not 100% sure, this is what my acupuncturist said. I agree, not a major symptom by any means, but it can be annoying.