@cmzaha they did not actually test her because like you, her reaction had become so severe. She had resisted going to the doctor, because she doesn't have experience with allergic reactions of any kind and didn't know the signs. Several of us who saw her were ready to drive her to ER! But she waited for her dermatologist appointment the next day.
By the time she got in, they took one look and immediately gave her a shot, which fortunately did the trick. The only new product she had used was a foaming hand wash from Ulta that contains CAPB. She would wash her hands with it before she put on her morning and night face lotions. Her reaction began the day she started using the hand wash, and got worse each day. At the recommendation of her derma, she has since checked, and none of her other products contain CAPB. She is deciding whether to test, or just to avoid CAPB and call it good. Her derma recommends the latter.
I've only done some basic research which showed that for most people, CAPB is perfectly safe. However, a substantial percentage of folks will react, usually around the eyes because the skin is so thin and delicate.
Here is a link to one of the articles that I read. If you scroll down to the picture of the older lady with red swollen eyelids, that is almost exactly how my friend looked, plus swollen lips and big red patches on her cheeks.
The whole reason I make my own products is that I do tend to get bad reactions, ranging from breakouts, rashes, and peeling skin, to sinusitis, headaches, migraines, and HBP. My only brushes with anaphylaxis have been with shrimp and ibuprofen; those were pretty scary, with pretty severe facial swelling to the point that the ER personnel visibly flinched in horror when they first saw me, then scurried to get me a prednisone shot.
My point in sharing all this is to let people know so they can watch for any reactions (theirs or others') and make informed decisions about whether to use CAPB, or something else. I'll probably keep using mine but will be watching carefully and also making extra sure it doesn't run near my eyes while washing my hair. No more face washing with it for me, either.