Armpit peeling and scabbing!!

I am 6 months pregnant and decided that go natural on the deodorant. I tried using oils and it just didn’t work. I checked reviews on Schmidt’s and decided to try it. I’ve been using it for about month now. For the first 2 weeks it was amazing. Smelled great and did what it was supposed to do. Then last week I noticed my armpits going darker and darker which I thought was odd but no pain so I just continued using it and now this week that layer of dark is peeling and scabbing!! Extremely painful!!