If it's ANY kind of hernia it's a belly button hernia. My husband has one, but it's about the size of a grape. He JUST was to the doctor for his regular check up, he pushed on it, it was soft, he asked my husband if it hurt - he said it didn't and the doctor just waved his hand and said don't worry about it. (his just came out of nowhere, it's not like it was small and grew). So I wouldn't worry about it as long as it doesn't hurt and is soft. And if obviously doesn't get bigger, my husband had his the same size for a year.