I wore the Dexcom 7 for a year and had a nasty reaction. I called them and they said they changed the adhesive, because people were complaining that it came off in the shower ( I didn’t have that problem at all, lol). I tried different things to help and some would work a few times and then I’d get the rash. I tried stick to hope and they worked the first time fine. Using both the underpatch and the overpatch. Well then I broke out only around the edge of the overpatch. Now I’m starting to wonder if it’s just me and I’m developing an allergy. I have an underpatch on now that is working great. I’m taking Zyrtec at the recommendation of my doctor and it seems to be working. I really love the patches so darn cute! And they stay on nicely.