Update March 2015: Strange twist... I finally saw my (old) immunologist who I trust very much, and without getting into all the details, it turns out that the "allergist" who did the test that led to my supposedly being glycerin sensitive wasn't actually a certified allergist at all. The test that was done was not standard and the reaction was simple skin irritation (not an allergic response). After about 10 months of avoidance, I've started using glycerin-containing products again with no problems.
Delving into the waaaaaay obscure health topics here folks, this probably won't interest most of you. But some of my most obscure and specific health posts are the most viewed ones on here by a long shot, so I know that people are looking for this info. I wished so much that I had access to a post like this, so I spent some time writing it up for whoever is next to be in this sticky situation.
A while back, I attempted to get some allergy testing done, and came out of it not even having had the tests done, and instead labeled with a glycerin sensitivity. I'm going to save all the sordid details of this, maybe for some other time (I still have to go through some further investigations to figure out what's going on), but the long and short of it is that since then I've had to remove glycerin containing products from my life as much as possible. (The only things I haven't found replacements for and am still using are quite ironically my antihistamine pills, Reactine, and cortisone cream. There is a "Cortate ointment" petroleum based alternative, but I don't find it works as well.)
You would not believe how many personal care products, soaps, and medications have glycerin in them, it's RIDICULOUS. Not exagerating, probably 99% or more. It's safe to say I have been slathering myself in copious amounts of glycerin for most of my life - which is hopefully a good sign that my sensitivity isn't terribly severe, but it may have been impacting the overall burden on my body. It's extremely hard to find products that don't have it, and it's not only inconvenient but incredibly expensive, suddenly having to replace everything you own with more obscure and pricier products.