Reaction to sensor adhesive?

Noticed the skin was itchier with my Libre this time. I limited itching it. Started off as a brighter red and now it’s more dull but there’s a noticeable mark that’s lingered. Finger pricking comparison tells me the readings are still accurate.

Just wanna know if anyone has had a reaction like this. My whole body has been itching like crazy for a month and I’m trying to see if this is an isolated incident or perhaps related. I usually itch a bit around the sensor area but it will go away and there’s not usually a mark