I've read that henna is good for skin conditions, including dandruff and seborrheic dermatitis. I once wanted to do a long-term experiment on my mom's psoriasis, but she declined (she did let me try it once, though, and while she said it made it very itchy while the paste was on/drying, she thought even the one application seemed to help a bit).
I don't recall if it had any effect on my seborrheic dermatitis, though. I've never noticed itchiness or anything after hennaing.
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