CGM site and Air pockets/bruising

I recently tried to place the sensor for the CGM below my pant line and when I did so the site blew up and looked like I had a golf ball under the skin. It is now a week later and its still hard in an area and bruised a beautiful spectrum of greens and blues... Has anyone ever had experiences like this? I was told it is an air pocket in the muscle tissue but Medtronic had no idea what to tell me...

Where do you guys put the CGM sensor and/or the infusion site for the pump? I've tried areas other than the stomach and have had issues...