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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.
Cancer: Lymphoma or blood cancers can cause the lymph nodes to swell. If swelling behind the ear occurs, it could be an indication of tumor growth. German measles: German measles is caused by the rubella virus and is manifested as a red or pink rash on the skin.