I woke up this morning and found a lump on my neck, a few inches below my left ear. It doesn't really hurt, but it's a bit sensitive and I can feel it there. At first I thought I slept on my neck wrong, but usually that pulls a whole tendon and it feels strained. This is different. I asked my dad, a doctor, and he didn't really know what it was, but his first reaction was "a lymph node?".I looked up the lymph node online and apparently it can enlarge for a few reasons, either because the body is fighting off a virus or bacteria or because there is a malignant cancer I am getting really really really worried. I am a 17 year old male. I am not currently sick (at least i don't think so). Is this common??????!! what can i do??!!