Both my girls had troubles with their belly buttons. The MCHN said DD1 had a granuloma, but when I went to the GP she was not sure and told me to use Betadine drops which seemed helped. The belly button was no longer mucky, but there was still a little growth there. If that had not worked she would have used the silver nitrate. With DD2 betadine did not work, so we were prescribed kenacombe ointment.