I've been on the sensor since April and now, 6 months later, I'm getting a rash where my adhesive is located. I keep one sensor in for 6 to 7 days (that is as long as they last). Once I remove the adhesive and sensor the rash will lasts for about a week. I haven't changed my routine of Mastisol and Tegaderm dressing. Plus all of the cortisone creams do not work. Thanks for your help.