Don't be a hypercondreact now, before you diagnose yourself with Cancer, just think back a bit.
What had you been doing before you noticed the lump?
You see, a few months ago, my brother went overseas and he got water in his ear. He kept sticking his finger in it to get it out. Anyway, the said his whole trip was bad because of the pain he was in. He couldn't hear properly out of it.
He saw a doctor and there was a lump behind his ear or something. Turns out he had a ear canal infection and his glands were just swollen. The doctor gave him antibiotics and after a few days he was find. However, defenitaly contact your doctor soon so you know and your comfortable.