Are there ghettos or seedy neighborhoods in Japan?

Question:

You know, the ones you don't want to wander into like they do in America?

Answer:

I don't know any "ghetto" neighborhoods existing like those ghetto NYC areas in Brooklyn or Bronx, with graffiti and hip hop culture going on, lol (just my imagination of how it looks like). However there are street thug yakuzas you can see in some yakuza infested streets, not neighborhoods. Here in Fukuoka, you can see them and you better don't get in their way. They might approach some foreigners and lure them to their "strip clubs" with "hot sexy young girls", but please oh god no, don't come.