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Thank you for your question.
Numbness in the toes and back problem may actually indicate a problem in your lower back.
There may be a pinched nerve in the back causing your problem.
I would recommend having a MRI of your lower back done to have this diagnosis considered or ruled out.
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Knot on the left side of the back actually goes more in favour of a muscular injury and happens if you have pulled a muscle.
So that is a possibility that I would consider as well.