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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.
1 Cold and sinus infection can also cause swollen lymph node in front of the ear. 2  Infection in the forehead, such as a boil or an infection in the upper eye lid, as in the case of a Stye can cause swollen lymph node in front of the ear.auses of Swollen Lymph Nodes. 1  An infection on the Pinna of the ear due to ear piercing can be a cause of swollen lymph node in front of the ear. 2  Sometimes, the salivary glands present in front of the ear get swollen.