Answer:
What can burn the eyes, sting the mouth, yet be consumed?
I'm the source of all emotion, but I'm caged in a white prison.
The man who made it didn't need it. The man who bought it didn't use it. The man who used it didn't want it.
Two people are born at the same moment, but they don't have the same birthdays. How could this be?
Though easy to spot, when allowed to plume, It is hard to see, when held in a room.
You use it between your head and your toes, the more it works the thinner it grows.