Stretch marks - Need these out!

[F8&Bthere]

Yes, as JJ suggests try the healing brush, or also it's sister the patch tool. Here's one quick (took all of 15 seconds) example of the patch tool....
You loosely select the area you want to fix using any selection tool you want (you might want to try one mark at a time as opposed to the way I did it selecting all of them at once) and find and select the patch tool (grouped with the healing tool in the tool menu) and click inside the selected area and drag it to a nearby patch of clear skin. It looks at first like you have a poor match but magically after you let go and wait a sec or two PS does it's thang and it ends up looking pretty good. You can see I didn't quite get it all, but I wasn't going for anything fancy.