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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.
Common sites for ear lumps include your ear canal, ear lobe, and behind your ear. Ear lumps can be caused by exostoses and osteomas, which are types of tumors that grow in the bones of the ear canal. An ear lump and tenderness in the bone behind your ear, along with pain and swelling, could indicate mastoiditis (infection of the mastoid bone).