Hello. I'm AAAA. Last night i noticed feeling some discomfort behind my left ear and has become increasingly uncomfortable since. it's round, hard, very tender to the touch, constantly aching, about the size of a dollar coin, though round like a ball. i'm nervous that it might be cancer. Can you please help understand what the typical early symptoms are to be concerned about and how to proceed if symptoms persist? thank you for your help! AAA