How long after getting your bellybutton pierced is it red?

Rendess will come and go through the healing process whit a navel piercing, any time the piercing is covered or subjected to irritation from clothing there will be redness. It doesn't mean that there's an issue just that it's a piercing that is irritated, so floppy shirts, loose clothing aroung the piercing and as much fresh air as possible during the healing process will minimize the redness you will encounter.