Our expert says:
It might be a neck muscle spasm, especially because you report that it comes and goes. A lump will not appear and disappear. I suggest that you go to the GP for an examination. If he finds that it is more likely a muscle spasm, then he can refer you to a physio for treatment. If not, and it is a lump, then he can refer you for the necessary tests. Good luck and I hope you feel better soon.
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