I Just need a bit of advice really . We have a huge family history or brain and lymph node tumours ( father , aunt on mother's side and her son) . I have a lump behind my ear that's been there a year and is slowly growing . I finally managed to get a doctors appointment and mentioned the lump and that i get dizzy spells and headaches and she dismissed it as a cyst ( even though it's a solid non moving mass) and told me she would be more worried if I had more then one??? I have high blood pressure at the moment so she dismissed my dizzy spells as that . How long should I leave it before I mention it again?