What deodorant can I use for sensitive skin?

I have very sensitive skin and I have psoriasis and eczema. I like to try and use all natural products. I used to use dove sensitive skin deodorant, but I want to try and use something that is healthier. I have tried Tom of Maine, Jason, the deodorants from Lush and everything in the local health food store. I always get a rash under my arms. I just tried a dusting powder from Lush that is cornstarch, cocoa butter and jasmine, and I still got the rash. I'm not sure what to do at this point. Help?