A couple weeks ago I had a rash show up under my breast, I used power, helped a little then I noticed that it was getting larger, so I told my cancer doctor and they said it is a heat rash then prescription of Nystatin to use and have used it for three days and no changes. It seems to be spreading across my chest. It doesn't really itch or hurt any, accept when I put the powder on. Oh and my blood count is excellent and I have been cancer free for 10 years now.