No one told me this was the side effect until Monday when I received my 4th annual shot of Kenalog. I mentioned that my butt had concave areas on both sides . As the nurse was injected into the left concave area, she said, "Kenalog shots cause it". Like it was no big deal---but now I have two concave areas on my butt and how do I fill them back in? No one tells you this until after 4 years and 2 caved butt cheeks?