Hey, this is my first time on here. But I have a question!
Okay so two days ago I noticed a lump behind my left ear. It does hurt a little, and it's kind of red like the skin is. Also it's gown too in size, now it's probably the size of a dime. I can feel it too, it's hard, and I can't move it.

What does this mean?
Should I go to the doctor?

Thanks!
~Ashley~