Back passenger tire too close to wheel well.

I know absolutely nothing about my car or
cars in general. I was driving my ford
contour and I noticed as I was going over
bumps that there was a sound coming from
the back right of the car. When I pulled over
I noticed that my tire was very close to the
body of the car or wheel well. It wasn't
touching but it was close enough that I
could not see into it like I could with the
other wheels. For a few months the
suspension must have been going because
the car makes creaking and springing
noises. The car drives okay besides those
sounds but I was wondering if anyone had
any ideas of what it might be that's wrong
with it. Like I said I know nothing about
cars. Could it be an Axel problem, strut,
suspension, etc. Any thoughts would be
helpful. I'm just curious.
Also, it may not matter but its bi-FUEL.