Hopping in to say that Erythromelalgia sometimes affects the face and ears etc, and that is notoriously painful. I have it but mostly in my feet/hands, and I suspect it is triggered by my MCAS It's typically burning/redness that is worse at night or due to temperature changes

THAT is interesting and I have to ask about the timing. I think she said something about that!

FYI, I don't know of anyone with just facial Erythromelalgia, I think the hand and/or foot involvement is mandatory It might be worth double checking CBC for elevated RBCs or hematocrit (note dehydration can artificially increase hematocrit levels). Polycythemia causes redness too