Lump on neck spine, family died from cancer, can this be cancer?

Hello. I have recently discovered a lump on the neck spine of my wife. It is located at the place, where the spine connects with the scull. The lump itself is hard (bony), immovable (it feels attached to the spine), and a little painful when pushed. My wife is 20 year old, generally healthy (exept of the stye on the right eye). The thing that worried me a lot, is that she had a bad cancer history in her family- her grandfather and grabdmother died from cancer. Can this lump be a cancer?

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