Body parts that are just no good for infusion site

My endo assures me that my daughter’s skinny thighs should be a perfect place for an infusion site, but we’ve had more trouble with them. They seem to go bad with annoying frequency. I’m ready to give up and just use the abdomen and butt sites until she gets some more fat on her. Does anyone else stay away from certain typical site locations because they just don’t seem to Have the Right Stuff?