I have this red rash under my arms. It isn’t all over my arm pit; it just looks like it’s in a circular shape surrounding the center of my arm pit, and sometimes it flakes. I use tom’s aluminum-free apricot-scented deodorant. Is it the deodorant that’s causing the problem? If so, what other deodorant should I use to get rid of this rash?

So I had always used a normal deodorant/antiperspirant. A couple years ago, it started leaving the gross residue in my armpits. For all that time, I would scrub it off every day with a de-greasing liquid dish detergent that did a semi-decent job. A couple weeks ago, I finally switched to a natural deodorant, Tom’s natural long-lasting care 12 hour long-lasting odor protection Aluminum-Free Deodorant stick (apricot scent). However, I still have a residue every day, although it’s not as bad. I’m really looking to not have to use the detergent anymore, especially since it actually can irritate my skin if left on to long, so I have to rinse it really well. I also would really like to avoid shaving my armpits (yes I’m a guy). If anyone else has had this problem/knows why this deodorant is causing it/knows what deodorant would be better, I would really appreciate your advice.