Answer:
Lovely and round, I shine with pale light, grown in the darkness, a lady's delight.
I drive men mad for love of me. Easily beaten, never free.
I always run but never walk, I sometimes sing but cannot talk, No head on which a hat to place, You always look me in the face.
I usually wear a yellow coat. I usually have a dark head. I make marks wherever I go.
I am round as a bowl, deep as a tub, but all the world's water couldn't fill me up.
You use it between your head and your toes, the more it works the thinner it grows.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?