What is wrong with Blac Chyna's butt? (photo)

All the work done on Blac Chyna's butt seems to be taking its toll. The mother-of-two was spotted out following her online row with baby daddy Rob Kardashian, but what's striking about the photo taken of her is her backside. It's still curvy but a part of it looks kind of deformed. Rob disclosed that he paid  $100K for her to get work done on her body after their daughter was born but