I had allergy testing done and where they do the little scrapes on your back of all the various allergens, they also do one that’s pure histamine as a control. You can kinda feel each area based on the reaction, some are a little itchy, but the grass area felt like a heat gun on my skin. It was insanely itchy and painful and explained why my face almost swelled shut when I rolled down a hill as a kid. It’s very not fun, especially if you have to be out and about during the summer months with people mowing. Fortunately, I got a treatment of allergy shots and it helped immensely.