I have a lump at the bottom of my spine?

18 female no medication , I have a lump at the bottom of my spine specifically the top of bum it almost feels like a giant marble that I am able to move ,its painful if I am sat down for long periods of time or am in a certain laying position I almost feel like it’s structural and part of the bone rather than an abcess or boil,I fell backwards on my coccyx about 4 years ago and bruised it I don’t know if it’s something to do with that please advise thank u


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