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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.
There are some causes of lump behind the ear that can be painful or painless. For example, a throat infection and mononucleosis, also referred to as Epstein-Barr virus, can lead to swelling around the neck area. HIV/AIDS, measles, and the chickenpox can also cause swelling around the face and neck.