Roll-on deo

Since forever, I occasionally feel weird pain in my armpits.

I'm 99% sure it's the roll-on deodorant, which I almost completely stop using until the pain goes away.

Sometimes the pain comes back when I start using it again, sometimes it doesn't.

Recently, I have started washing my roll-on deodorant with soap and I honestly believe this actually solves the issue.

Any insights?

Sorry for the weird title, the rules prohibit using the word "deodorant" as it contains "odor" in it..