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I know it's been a while since you posted this but I thought to reply anyway :) I think you can totally use calcium bentonite clay on your rash topically. I have a rare skin disease (autoimmune) and get a severe itchy rash all over my chest, breast and neck. I was suffering for a year until I discovered bentonite clay. I use a few spoons (2-3 or even more depending on the area), mix in some water until it becomes a clay/paste. I prefer mine to be thicker meaning I don't add too much water but it's preference. I leave it on for as long as I can (1-2 hours) whilst sitting down and I make sure to have a cover underneath me so if it gets messy it's easy to clean. Make sure your bowl and spoon is metal free, and metal interferes with how it works, so you must only use plastic! You can do it everyday for 1 month and then do it a few times a week, just see how it goes. I don't recommend taking it internally. But even by applying it topically it removes the toxins and heavy metals from your skin. It has really helped me and I hope it helps you too! :)