I'm sure I've seen a thread regarding this in the past but I can't find it now I'm looking for it. My Xantia has started to bubble rust through a few inches up from the wheel arch, as seen in the pictures below. Where is the rust coming from, the top of the arch? Anything that can be done to cure/help it?
Thanks

The rust isn't the stuff right by the arch, it's a few inches above and behind.

