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This could be a benign lipoma--a fatty tumor.
They can grow that fast and they aren't dangerous but if it's bothersome it can be surgically removed
Let me know if you need any more information please
This is Dr. David
lipomas are soft and usually grow slowly.
you have HBP? high blood pressure?
you should see a doctor and get an ultrasound of the lump or MRI scan.
it could be a synovial cyst or ganlgion cyst.
in rare cases you can have a cancer
cancer in the paraspinal area would be very painful and tender.
how large is it now?