Answer:
The person who makes it has no need for it. The person who purchases it does not use it. The person who does use it does not know he or she is. What is it?
Take off my skin, I won't cry, but you will.
What is given but kept by the giver?
Not born, but from a Mother's body drawn. I hang until half of me is gone. I sleep in a cave until I grow old. Then valued for my hardened gold.
Different lights do make me strange, thus into different sizes I will change.
I am owned by Old McDonald.