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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.
An infected eardrum looks red and swollen. Ear infections are not contagious in adults or in children as the fluid is well behind the ear drum in middle ear infection. But virus cold can be contagious, which is one of the causes of ear infection.