Hey funny you mention this, I've only recently started to get similar symptom. My face goes all warm - i was afraid it might be start of menopause!..lol..ok maybe i shouldn't laugh, might be that! But seems to happen during the day when i am feeling pretty good. It feels as though blood is now beginning to circulate, as i find the rest of my body is also warmer than usual - and it's winter here at the moment. Interesting development! Wonder what it means.
PS - I had my driver's licence photo taken the other day and you can see that my cheeks are red!..lol - proof that it's not in my head!