Bests & Worsts Reviews from Amazon

I started using this deodorant in July 2018 and LOVED it!!! I couldn't ask for more. The scent was great and lasted. I tend to get sweaty and stinky. While I was still sweaty, this took care of the stink. But then! I ordered more in August and now I get an itchy, painful rash in my pits. I stopped using it for a while and the rash went away. When I began using it again, the rash returned. What Happened?!