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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.
1 Redness, swelling, pain behind the ear, and fever may be caused by an infection of the bone located behind the ear (mastoiditis). 2  Pain will get worse when you press on the bone behind the ear. 3  This infection is rare and usually occurs 10 to 14 days after a middle ear infection.