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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 refers to inflammation of the middle ear. Acute otitis media occurs when a cold, allergy, or upper respiratory infection, and the presence of bacteria or viruses lead to the accumulation of pus and mucus behind the eardrum, blocking the Eustachian tube. This causes earache and swelling. When fluid forms in the middle ear, the condition is known as otitis media with effusion.. This occurs in a recovering ear infection or when one is about to occur. Fluid can remain in the ear for weeks to many months.