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Lymphadenopathy is a condition where the lymph nodes, small round organs found all over the body, begin to swell, which could cause painful lump behind ear. The swelling is caused by accumulation of immune cells within the lymph node.
An infection in the ear canal, outer ear, or the mastoid bone behind the ear can also cause pain. These types of infections often occur with redness and swelling of the outer ear or the area. around the ear, and require prompt medical attention. Infections of the teeth or gums due to.