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We understand your concerns
Warmness or warm sensation on left side of face around ear region is quite a normal feature during winter season and periods during season changes. It normally dies down after a while.
If you have it for more than one year, what is frequency? Does this have any seasonal effects or variations? Any medical history of sinus infection
or ear problems?
Mostly it seems like psychological effect to me because of its commonness. It does trouble people sometimes, but if you start thinking that it is some sort of health risk,it starts troubling more and more.
Consult a general physician and rule out any medical possibilities.
Get well soon.