Question

What is the hole in stomach called? What is the cotton-like substance I find in there every 6-8 hours, even if I take a bath?

Answer 1

I was unable to follow your question.

Explanation:

There is no hole in stomach. If you mean to say the belly button. It is not hole. It is the place where umbilical cord was attached to a baby.
After every six to eight hours the cotton fibers of our hosiery undergarments are accumulated in belly button.
You need not bother of the cotton like substance in belly button.