question: What may cause a lump behind my left ear? It s about the size of a quarter and has no pain. Not obvious except upon palpation. I also have pain on my left eye (not the lid but the bottom) when it is touched or blinking excessively. My throat is somewhat sore, more so on the left side, however it isn t exactly a sore throat as one you have when you have a cold. Could it be sinuses or do I need to see a doctor?