Answer:
While you were folding a letter you got me. Usually you will do whatever it takes to avoid me but now you can't help but find me.
The more it dries the wetter it gets. What is it?
I climb higher as I get hotter. I can never escape from my crystal cage.
With a halo of water and a tongue of wood, stone as skin long I stood. What am I?
The person who makes me doesn't need me. The person who buys me doesn't use me. The person who uses me doesn't know it. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.