It is not cancer i think. I am not a specialist but still i can say it is not cancer because you have hard lump behind your left ear which is a general issue if we think positively. It is because of cold, nothing else
Why did you decide to post on the cancer community? It seems to me there may be other better communities. One doesn't come to mind, try a search on your subject line and see if there is any thread/community that has discussed that issue.
There is nothing in your brief post that makes me suspect cancer...but I am no expert on cancer, I come here to learn and to share any comfort or experience I have to offer.
I looked at this post simply because it has gone without a reply, hope this helps you find some useful inputs.
Merry Christmas