Ok so this is so NWR, but I thought you ladies may have some tips. Apparently after YEARS of using the same deodorant (Secret) I am now allergic to it? But only in one armpit, hahaha. It's awesome. It's all red and quite painful.

Anyway, I was wondering if anyone knows (1) Why this happened? (2) Do you have any suggestions for others to try that work for [apparently] sensitive skin? I read that it could be the scent in the deodorant, but the thing is I use have one at my house and one at FI's house, they are both Secret but different scents and this has happened after using both of them, so I don't know.... maybe it's something they use to make the scent? It's very painful & annoying, I can tell you that much. TIA