Welcome to the MedHelp forum!
Lump behind the ear could be an abscess, folliculitis (hair follicle infection), lipoma (localized collection of fat), a cyst, an inflamed lymph node or a neurofibroma (localized harmless swelling in of nerve and connective tissue). Swollen lymphnodes behind your ears could be due to chest infection, tonsillitis or pharyngitis, dandruff, infection of ear or even metastasis from a cancer. It could also be of tubercular pathology. A fine needle biopsy or a CT scan of the swelling is only confirmatory. Hence apart from ultrasound this should be done. If the lump is growing, it should be excised and biopsied. Do discuss this with your doctor and get yourself examined.
Hope this helps. Please let me know if there is any thing else and do keep me posted. Take care!
i had had almost the same thing .. my ent doc. put me on antibiotics it made the lump go down a little bit . all my doc. did was feel it and told me by feeling it see was sure ( either by it not moving or moving ) that is was not cancer but everyone is different. it has been two years i still get pain in my ear and sore throat. but i take some ibuprofen and it helps. Also i would put a heating pad behind my ear. but i was told some people just have them for life but u should really only do what your doc. says thats what helps me