Answer:
I am always around you but often forgotten. I am pure and clean most time but occasionally rotten.
Weight in my belly trees on my back nails in my ribs feet I do lack.
You walk into a room with a match strike the match and notice a candle a lamp an oil burner and a fireplace. Which do you light first?
I go through a door but never go in and never come out.
My voice is tender my waist is slender and I'm often invited to play. Yet wherever I go I must take my bow or else I have nothing to say.
No matter how little or how much you use me, you change me every month.
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic