Answer:
I stay where I am when I go off. What am I?
Lovely and round, I shine with pale light. Grown in the darkness, a lady's delight. What am I?
What is cut on a table but is never eaten?
Though I am only two words I have thousands of letters in me
You use me between your head and your toes the more I work the thinner I grow.
No matter how little or how much you use me, you change me every month.