You cannot dye your hair without washing it. The chemicals used can be harsh on your skin. The whole idea of dye without washing sounds like a recipe for total disaster. Please, however wait for the opinions of others and/or see a dermatologist first.
That may sound extreme advice and I'm sorry for that, but over the years here I have heard the tragic aftermath of many ill advised 'cosmetic' issues and treatments and would really like people to think first (as you have done) than ask for advice on treating a new issue afterwards (men and women alike).
Take care, Steve.
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