Is this an allergic reaction or something else? [Please read details.]?

Sporadically over the last few weeks my face and ears become very flushed and hot, and start to itch. My health insurance does not cover dermatologists or allergists, so I would like to potentially narrow it down to one if possible, so that I can avoid breaking the bank over an issue that does not appear to be urgent.
I have a history of allergies, anxiety, and a skin condition that causes facial redness [KRPF]. I do not have rosacea.
I don’t think it is anxiety related, since it isn’t happening during the times I’ve had spikes in anxiety recently. I haven’t changed anything in my diet or skin products, but I don’t know how to rule out allergies, otherwise.
Is there some way for me to determine whether this is an allergic reaction or a dermatological issue, so that I can figure out what kind of doctor I might need to see about it? Or, perhaps something as simple as ultimately eliminating a [new?] allergen.