Awhile back I had made my own deodorant, which was fantastic at keeping my pits smelling divine. However, because I already had a rash from my previous store-bought stick when I switched, the baking soda in the homemade stick irritated the rash enough that it wouldn't go away. It took me awhile to figure out what to do about it, aside from using nothing and stinking. Eventually I decided to try putting a dusting of corn starch on them, and nothing else for awhile.
It worked! The rash is just about gone, and once it's completely healed I'll try the homemade stick again. Should only be another week or so to be sure.