I'm pretty sure its the latex. I've been having increasing sensitivity to it from various sources - and I've had surgery twice this year that even though they followed latex free protocols in the operating room, the stuff is still absolutely everywhere in the hospital so I've gotten exposed quite a bit recently. It turns out that I've been using latex free bandaids without making an effort to do so, the kind I chose just happened to be latex free, but the box we bought most recently wasn't latex free - serves me right for changing brands. I've had to avoid the big obvious latex things like condoms and gloves for about a decade now, but I'm starting to have to pay attention to less obvious sources. I had a similar burn reaction to an ace bandage (the kind used for a sprain) recently.
I resorted to a steroid cream. It took away the burning sensation and alot of the redness. you can still see a bandaid shape on my neck, but its not nearly as pronounced as before.