Lump behind the ear could be an abscess, folliculitis, lipoma (localized collection of fat), an inflamed lymph node or a neurofibroma (localized harmless swelling in of nerve and connective tissue). However swollen lymph nodes
behind your
ears could be due to chest infection, dental problem, tonsillitis or pharyngitis, dandruff, infection of ear. There are many other causes for lymph node swelling, but these swellings will come gradually and not pain to start with.