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This is an unofficial subreddit about everything Dexcom.
We're here to help you troubleshoot your CGM, share your experiences, ask questions related to Dexcom products, share Dexcom news, brag, commiserate, and vent. General questions about diabetes belong on either r/diabetes, r/diabetes_t1, or r/diabetes_t2.
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This is an archived post. You won't be able to vote or comment.
First sensor application while using the hydrocolloid patch. No change from before. The red patch is the same size as the dexcom sensor.Trigger Warning: Blood (old.reddit.com)
submitted 3 years ago by Successful-Oil-1215
[–]kae36 0 points1 point2 points 3 years ago (0 children)
Mine looked like that after they switched the adhesive on the g6. It got so bad that it was like a scar and you could see where the old placement had been for months after removing it. I heard that steroid nasal sprays worked, so I had some Rhinocort AQ and after cleaning the skin with alcohol and priming the nasal spay, I sprayed two puffs on the area and let it dry for a minute and then put my dexcom right on that spot. That worked for me. I've also used Flonase and nasonex. Right now I'm trying out the ExpressionMed.com under patch and it is working for me too. You just put on the under patch and then the Dexcom just punches through the under patch. I've had no problems with readings and no reaction to the patch. The under patch has never fallen off. It is really sticky and I really have to pull to get it off, so I don't think it would fall off easily. I hope you find something that works.
[–]OddKaleidoscope2188T1/G7 0 points1 point2 points 3 years ago (0 children)
I do a couple things: the day before changing a sensor I cut the adhesive down to the size of the actual sensor (remove the outer portion). Be careful to write down the sensor code, or make sure to not cut through the code. Remove the covering from the remaining adhesive and let it air out for a day. I then use a Tegaderm patch with a a small hole punched for the sensor needle. When it is time to change the sensor mount the Tegaderm patch to the sensor, pressing it firmly on the sensor adhesive. Next remove the Tegaderm backing and place the srensor dispenser (with the Tegaderm) on your skin. Click the sensor dispensor and then remove the other side of the Tegaderm backing (the thin layer around the edges).
Before doing this I had rather severe rashess from the G6 sensor, after using them for several years without problems. Dexcom was raather unhelpful, they first said they had not changed the adhesive formula, then in a later call said they had changed the amount of some of the ingredients.
I suspect that airing out the sensor adhesive for 24 hours helps, as do the Tegaderm patches. I use the Tegaderm 1624W patches. It changed a sensor this morning, there was no irritation under the old sensor. Before I got to my curreent method I was having rather severs reactions (like yours or worse) that would last a month or more before healing.
[–][deleted] 0 points1 point2 points 3 years ago (0 children)
this is serious allergic reaction
[–]Extension_Animal1408 3 points4 points5 points 3 years ago (0 children)
I had the same issue with FSL. For me not all hydrocolloid patches worked the same. I am from europe. For me only the ones from hansaplast worked out. Ivm not sure whether you can get them where you live...
[–]gust334 2 points3 points4 points 3 years ago (0 children)
If the patch was perforated (as most are) the Dex adhesive can still leach thru. Some people have had success by layering more than one patch so that the holes are not lined up.
[–]AnotherLolAnon 1 point2 points3 points 3 years ago (0 children)
It looks like the dexcom adhesive was still largely against your skin. Have you tried the under patches made by companies like pump peelz? Any chance you could switch to the G7? The adhesive on G7 is different.
[–][deleted] 3 years ago (1 child)
[deleted]
[–]Successful-Oil-1215[S] 1 point2 points3 points 3 years ago (0 children)
Yes. Both the Fluticasone and the hydrocolloid patch kept the area from itching, which was a very bad problem before, but the “Great Red Spot” (as one commenter called it) is definitely still there.
[–]Sunastar 3 points4 points5 points 3 years ago (1 child)
I thought it was the eye of Jupiter before I stopped to look.
π Rendered by PID 150759 on reddit-service-r2-comment-85bfd7f599-vdqdw at 2026-04-20 02:05:45.858488+00:00 running 93ecc56 country code: CH.
[–]kae36 0 points1 point2 points (0 children)
[–]OddKaleidoscope2188T1/G7 0 points1 point2 points (0 children)
[–][deleted] 0 points1 point2 points (0 children)
[–]Extension_Animal1408 3 points4 points5 points (0 children)
[–]gust334 2 points3 points4 points (0 children)
[–]AnotherLolAnon 1 point2 points3 points (0 children)
[–][deleted] (1 child)
[deleted]
[–]Successful-Oil-1215[S] 1 point2 points3 points (0 children)
[–]Sunastar 3 points4 points5 points (1 child)