Several days ago, I discovered a small lump on the right side of my neck. It's not a lymph node (under my right jaw) that I sometimes feel when I'm sick. It's a bit under the hairline behind the ear, if that makes sense. I don't feel one on the other side. Do you think this is something of enough concern to take to my doctor? I'm 25. My mom had thyroid cancer but her nodules were in the front, plus she was in her 50s. Thank you for any advice.