Try putting the pulp left over after juicing wheatgrass or barley grass.
Jam it in there, leave it in there, and forget about it. This is not
intended to diagnose or treat any disease and I am NOT RESPONSIBLE.
It does work though..
Lay on your back and fill your belly button with hydrogen peroxide. It will bubble and clean out the bacteria trapped down in their. Repeat this for a few days. Promise it will go away.
It is probably yeast. Topical creams are sold over the counter for this. Clean out your belly button well, pat dry and then add cream. If you do this for a couple of days it should clear up.