Answer:
Iām tall when Iām young. Iām short when Iām old. I can light up your world. What am I?
I do not contain flesh feather or scales; yet I have fingers and thumbs.
When I am caught I am thrown away. When I escape you itch all day.
Draw fire or fill me; I'm still empty.
I am always around you but often forgotten. I am pure and clean most time but occasionally rotten.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?