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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.
Painful lumps behind ear causes include: 1  Abscess â These are lumps that develop when tissue or cells become infected. 2  Dermatitis â This takes place when waxy dead skin cells or dry skin builds up and is joined by inflammation and redness. 3  Mastoiditis â The mastoid bone is found behind the ear and can get infected.