Answer:
When they are caught, they are thrown away. When they escape, you itch all day.
Thousands lay up gold within this house. But no man made it. Spears past counting guard this house, but no man wards it.
I bubble and laugh and spit water in your face. I am no lady, and I don't wear lace.
Three little letters. A paradox to some. The worse that it is, the better it becomes.
What stays on the ground but never gets dirty?
You use it between your head and your toes, the more it works the thinner it grows.