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Allergic how? I wonder if it just some mushrooms species or all of them.

I don't know about all mushrooms, but the mushrooms I've ever eaten like button mushrooms, I feel itchy and have red bumps

That's kind of how I get with pistachios, but not with any other kind of tree nut. Maybe more mild species of mushrooms like oyster mushrooms wouldn't give you the allergic reaction. The best way is to only do a small taste test then spit it out to see if any reaction occurs.