This is going to sound odd, but Lola has what looks to be a dent in her side.
There is litterally an indent about and inch or so down from her spine on her side. It feels almost like the fat has disappeared from that spot.
I poked around the spot and It's not painful and there is no fur missing.. no nothing. Hubby thinks she may have ran into the corner of the wall in one of her "zoomie" moments but I don't know.
I tried to search but didn't find anything. Here's a pic I just took.. I need to get one of her standing but you can still see the spot.