I've been using Head and Shoulders on my chest and back for over a month now and have definitely seen a great improvement!! My chest and back weren't absolutely horrible, but they were always full of bumps. I just use the regular Head and Shoulders (using a cheapy generic right now and it doesn't seem to be working AS well, but ok still). I also soak in an Epsom salt bath a few times a week. I started doing that at the same time I started the H&S, and I think the combination of the 2 was what really helped to clear me up.
I thought about using it on my face, but just thought it would be too harsh!
If it's worth having, it's worth fighting for.