When you notice a lump on your neck, back, or behind the ear, it’s likely that your brain would leap to the worst-case scenario, although most lumps are harmless.
These lumps are different in size and appear because of various reasons, including skin issues or more serious conditions that require medical care. If you know the reason why the lump appeared somewhere on these areas, it would be easier to determine whether it’s something to just keep an eye on or something more serious and even life-threatening.