Lots of people will probably recognize this; a tough little bump that appears behind your ear, and disappears just as suddenly. However, there is nothing to worry about. This is what it means.
Marble
It’s a recognizable but often misunderstood phenomenon. The bump is usually the same color as your skin, smooth and feels like a small marble. It doesn’t hurt to touch it. The strangest thing about it is that it just comes and goes as it pleases, though. What causes this? Is it dangerous or not? it is not dangerous so there is nothing to worry about.
Lymph nodes
The bump is completely harmless. Even better; it’s a positive sign! When you notice it, chances are that you’ve got a swollen lymph node. These small lymph nodes are glands that make sure all of the toxins, waste and other unwanted materials are taken out of your body through your blood. In places where the glands are centered (behind your ear, for example), they can start to swell.
It means a positive immune system
Having a bump like this is actually very positive: it means you’ve come into contact with bacteria and that your body is doing all it can to fight them. The glands do this by multiplying white blood cells. This multiplication is what makes the lymph node swell up. But if you tend to suffer from fever or any sickness along side, then it’s time to visit your doctor.