I had to take my navel piercing out because my belly button itches and irritates me that much lol, and my belly button hasn't even popped yet! It's just stretched.
It's happening myself also, if it's not the itching it's pain- but yup it's from skin stretching and pulling. :/
Its normal Even tho it itches all the way in the hole..?? lol
My stomach and belly button itch a lot. It's just your skin stretching out and pulling. But its pretty annoying. Try putting lotion or stretch cream on it.