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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.
Causes. Infections of the middle ear caused by bacteria or viruses can enter the ear and cause the ear to be hot. According to MayoClinic.com, these infections sometimes result from another illness such as a cold or the flu.