You might try Tea Tree Oil, can get tea tree shampoo also; it is good for such types of irritations.
Sounds like you are pulling out a lot of toxins and it coming through your head. Have you tried to do near infrared sauna for detoxing, it pulls a lot out and it might help the rash.
I think anything that could help will go up for consideration.
I can show you how to make a very cheap sauna if you want, just get hold of me and I will email you the directions. Go to our site jesichashope.org and contact the director from the contact page. I will shoot you over the directions. Meanwhile try tea tree oil.
How are your tests by the way after using the ozone?