# How to deal with a Dexcom allergy

**URL:** <https://forum.fudiabetes.org/t/how-to-deal-with-a-dexcom-allergy/2138>\
**Category:** Tipwiki\
**Tags:** wiki, dexcom, allergy\
**Created:** [September 24, 2017, 4:38pm UTC](https://forum.fudiabetes.org/t/how-to-deal-with-a-dexcom-allergy/2138 "2017-09-24T16:38:46Z")\
**Posts on this page:** 1\
**Showing post:** 16

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**Author:** ![RachelMaraii](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/rachelmaraii/32/12439_2.png) [@RachelMaraii](https://forum.fudiabetes.org/u/RachelMaraii)\
**Post date:** [May 7, 2024, 3:07pm UTC](https://forum.fudiabetes.org/t/how-to-deal-with-a-dexcom-allergy/2138/16 "2024-05-07T15:07:39Z")

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Figured this is a better place for my allergy saga, continuing from here: [Dexcom g7 newness frustration - #89 by RachelMaraii](https://forum.fudiabetes.org/t/dexcom-g7-newness-frustration/13794/89)

This “how to deal” thread has been super helpful. Thanks Michel for all the research. I am feeling pretty discouraged… but at least there are still a few steps left to try.

My recent allergy adventure:

1. In March, after several allergic reactions to Dexcom G7, I tried a new combo of Flonase / Cavilon / Tegaderm / sensor. The result was bruise-like and icky and really freaked me out! Finally pushed me to schedule an allergist appointment.
2. While waiting for my appointment, tried another combo: Flonase / Cavilon / hydrocolloid / sensor. Success!! I got 3 full sensor sessions without any irritation.
3. Swapped sensors the night before my first allergist appointment. Because of the long list of medications not to use before allergy testing, I thought I’d “play it safe” and not use Flonase. My combo this time was Cavilon / hydrocolloid / sensor.
4. Finally went to the allergist last week (sensor day 1). My allergist said he’d never seen photos like the bruise-like disaster I got when trying Flonase / Cavilon / Tegaderm / sensor. Gotta love surprising doctors. 😅
5. Of the allergens tested, we determined I’m allergic to Balsam of Peru (used as a fragrance and antiseptic) and Colophony (used as an adhesive).
6. On Thursday (sensor day 3), the tell-tale itching begins. Throughout the weekend, the sensor site becomes hot to the touch and increasingly uncomfortable.
7. My sensor failed at 6:00 a.m. this morning (sensor day 7), after 18 hours of sporadic and inaccurate readings. UGH. Removing the sensor, I’m definitely allergic to something in the hydrocolloid. 😢 Was it the lack of Flonase? Or did my body just finally recognize the allergen after a month?

Trying one more sensor with the Flonase / Cavilon / hydrocolloid / sensor combo. Maybe Flonase is the magic I need?? 🤷‍♀️ 🤦‍♀️

At least now I can reach out to hydrocolloid manufacturers about ingredients I’m allergic to. Maybe a good one exists. Just feeling tired and discouraged by it all; my husband was confused by my pessimism this morning. I appreciate that I can commiserate with y’all when we have bumps in the road. It’s just exhausting sometimes! 😮‍💨

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