I got bitten by some unknown insect?
Last Saturday it was rainy in Illinois and flood near some place. So i might not have able to get into my car without getting my shoes wet. Then I decided to grab some rock and step on it. When I grabbed a black grey rock, suddenly I felt sharp pain. My palm got some red mark. The rock wasn't that pointy or sharp and it couldn't have caused it. Now after two days, my palm feeling itchy. What insect could it be and any potential danger?