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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.
Otitis Media (Ear Infection). Otitis media, or infection of the ear, can cause ear pain as well as itching. This is especially true for otitis externa or swimmer's ear, a condition in which the outer ear canal becomes infected. Infection can also lead to redness and swelling.