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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.
The symptom of a swollen outer ear can be perichondritis, an ear  cartilage infection caused by bacteria. Another symptom is pain. A  cause for this condition can be injury â¦of ear cartilage due to  factors like cartilage piercing or ear surgery.