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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.
A painless lump behind the ear can be big or small in size, and it can go unnoticed for days or weeks. Essentially, it is an area of swelling that can take place anywhere on the ear. Some people may refer to it as a bump, nodule, tumor, or cyst. Depending on what the cause of the lump behind the ear is, it can be soft or firm. Some people even get multiple painless lumps behind the ear.