Well, the sensor I've been wearing most recently gave up today. I knew it wasn't positioned quite right, but after a day of constant 'LO' readings, I called Abbott when it finally lifted to much function properly.
To be fair, I was pleased to take it off because it was never very comfortable. I think I managed to get it to stick into my muscle, which I don't recommend. Anyhow, after removal, feeling around the site, it feels like there is a pea under the skin, and I have a mini Vesuvius there waiting to erupt. It feels massively like a big spot. I'm going to give it a few days and treat the skin with antibiotics, but I can't help but think that either I have scarred my triceps or introduced some sort of infection. I guess I'll find out next week, if it doesn't get better over the next two or three days.
Here are a few pics. It is most definitely not a reaction to the adhesive!