I had this exact problem on the side of the fuel filler. The pointy bit of the bumper basically stuck out too far. I got it replaced under warranty.
I suspect that it may have been overfilling the car and allowing diesel to run down the side caused the plastic to deform and bend out. I now make sure never to go beyond the first click when filling the car.
The dealer has had to replace one other F10 bumper with the same problem (Omagh, N.Ireland)
Last: 330cd Sport - Silver Grey, 335d M Sport Coupe, F10 535d M Sport.
Current: AW F21 M135i, Coral Red, Pro Nav, Vis, HK, & Clunky Adaptive Suspension
Current: F15 X5 XDrive 40d M Sport - Space Grey, lots of toys.