I have found that when I itch after henna, that I just haven't gotten it all rinsed.
It takes a lot of rinsing with henna. I rinse and rinse and when I think it is gone I rinse some more. Otherwise I itch. That has been my results.
I have taken to using a backyard water hose so that I make sure that it is all rinsed out. I find that is the easiest for me at least. My shower doesn't have a lot of pressure.
Oh and I never use a protein conditioner after henna either, I seemed to remember it made me itch too.
HTH
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