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Why do my ears get red hot and burn a bit sometimes? Vasodilation: The outer ear or pinna has a rich blood supply and sometimes, the nerves that dilate (expand) those blood vessels (branches of the vagus nerve) become activated and the blood vessels dilate and give a red color to the pinna and a warm feeling.
For some people, the ears can uncomfortably hot or even painful. To the very least, it can be embarrassing. There is very little that you can do for this, but since you mentioned blood pressure, the use of a class of drugs called beta-blockers has been used for red, hot ears. These are use for high-blood pressure, preventing migraines, and other cardiac problems. Sometimes it helps; sometimes it doesn't.