Yes, you definitely should get it checked out, and you should probably do it soon. I'm not diagnosing you with cancer, or anything serious, but when you have a hard, immovable lump, it can indicate that.
They all say that if you have an immovable lump, you should get it checked promptly. I honestly don't want to scare you - it could be nothing serious. You should get it checked, though. Let the office staff know that you have a hard, immovable lump in your neck that you've had for however long, and take a good guess - a few weeks? A few months? - and if they can't see you promptly, go to an urgent care.
Let us know what happens.
Hello~I agree with Emily, you should have it check ASAP, it may be nothing, but when they are hard and immovable, that is a red flag to me. Please do it sooner rather than later, if it IS anything serious, the sooner they catch it, the better.
Please keep us posted on the results.
One way to not worry too much is to know about the ways that a not-cancer condition can look like cancer. A usual cancer can make a node fixed when it grows right through the node, like sending out tendrils or rootlets. Alternatively, a not-cancer condition can be very inflammatory, so that immune cells create fibers in and even sometimes around a node. Those fibers (fibrosis) can mean that the node stays enlarged for a long, long time - and that it possibly becomes fixed.
How did it go at the doctor's?