My nape neck piercing has a cyst I think?

Two options you can go to a doctor and ask him. That would be the best choice. Or leave it and see if it heals. I reccomend the doctor. Peircing are tricky things and should not be handled if you're not completely sure. Expecially something like that I'd go to a doctor and ask him. Or even give him a call and ask about it explain what it is and how it feels and if you should go in. Good luck