This problem has as many answers as questions. I can tell you if you have ruled out food,mood and weather. if it mostly occurs in the early evening answer this question.do you chew gum? I did to cover my breath after lunch and coffee.the constant action irritated my jaw and I suspect was linked to the ear.I would subconsciously rub my ear ever so slightly or even hold the phone up to that left ear and bam red ear for an hour. this may not be the answer to everyones problem but it might be yours.
Comment
My sister's left ear is very hot right now. I don't think it is anything to worry about.
Replies
This problem has as many answers as questions. I can tell you if you have ruled out food,mood and weather. if it mostly occurs in the early evening answer this question.do you chew gum? I did to cover my breath after lunch and coffee.the constant action irritated my jaw and I suspect was linked to the ear.I would subconsciously rub my ear ever so slightly or even hold the phone up to that left ear and bam red ear for an hour. this may not be the answer to everyones problem but it might be yours.