Freestyle Libre - Allergic Reaction

I have been using the Freestyle Libre sensor system for over 2 years, changing sites every 2 weeks etc… However, a few months ago my skin started to show allergic reactions (i.e. rashes and blistering) - probably I developed a contact allergy to the adhesive tape: Has anyone experienced similar reactions? Are there any ways to prevent or alleviate these reactions (e.g. I tried to put Tegaderm below it but I would still get the same issues)?

Spray Flonase on your skin before putting the sensor on. This should alleviate any skin reactions to the adhesive.


I’ve found that Benadryl helps with allergic reactions, including those affecting the skin. Check with your doctor re effects on blood sugar - I haven’t used it in a very long time and can’t recall.

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Thanks for your suggestions. I will try these and see if they work

Im my experience, Benadryl doesn’t or hasn’t effected my bg at all. Curious to hear what others experience has been!

I had some weird blood glucose swings while taking benadryl and claritin. Nothing terrible. I probably could have adjusted my insulin doses to accommodate, but I didn’t really believe my symptoms at the time really were allergies anyway, so I decided it was easier to just stop taking the allergy medications.

I’ve been using the Libre a couple of years also, never had a problem after taking one off and having a skin irritation, just a little redness. The past couple of months though I do get a lot of irritated redness type rash. It’s a perfect crop circle for everyone to see at the gym. I use A&D ointment and neosporin for a few days until it clears up. It’s always healed for the next sensor 14 days later. I’m wondering if my dryer skin this winter has something to do with it

I have recently had the exact same thing happen to me. The rash is really itchy and lasts long after I remove the sensor. I have stopped using the Libre because of it. However, I have to say I am actually enjoying not having it on. I didn’t realize how much I was checking it, how many times a day I was having to be cautious about not putting pressure on the sensor because of where it is, cautions about not ripping it off when I change (esp sports bra). It feels better not having it! I do have to finger stick more, but at this point, I really prefer that!


I have had the exact same reaction. I have been using the Freestyle Libre for about a year and now I have unsightly skin rashes, They have obviously changed the adhesive. I am African-American so my rashes went from red to black and they look terrible. I’ve been applying aloa vera and Vitamin E hoping the rashes won’t scar my skin.

I’m wondering about some of the skin barrier adhesives that are out there, such as Tegaderm. Assuming of course that it doesn’t cause its own sensitivity response, you could cut a little hole for the filament and tape the sensor on top of the skin barrier.
Now one thing I have noticed about Freestyle when I’ve used it - it does tend to wrinkle and pull off after a few days. But it could be my skin type, lotion use or other factors affected it, and there may be other barrier adhesives that last longer.

I tried that idea with using Tegaderm under the sensor - both with and without cutting out a small hole. Without cutting out a hole (i.e. putting on the skin barrier first and then trying to go through it with the applicator) the metal part of the sensor won’t go through it. And cutting out a hole renders the skin barrier useless since the skin will still get in contact with the original adhesive and i get the the same rashes. My dermatologist prescribed impoyz which helps with healing the skin afterwards but so far nothing prevents the rashes from developing. Apparently it’s a contact allergy to the adhesive isobornyl acrylate and quite common as it seems from other forums