I got my navel piercing a week or two ago and I cleaned it as I was told and in the beginning it was fine but now the ball on top is starting to go inside. My friend said just keep pushing it up from the bottom and keep clearing it, and make sure you tighten it.

It's also itching really bad and the hole is getting bigger, kind of enveloping the ball, letting it get inside more.

Why is it trying to go inside? What can I do to help it?

I tend to sleep on it, bend down a lot and tend to wear tight pants where the button of the pants are on top of the piercing.

What can I do?