That doesn’t look like a blood blister to me. Blood blisters happen from the skin being pinched really hard and it (usually) will instantly fill with blood. Did something like that happen or did it just appear? I agree it kind of looks like poison ivy or poison oak
At first it was a little painful then the swelling went down but yeah it was a little itchy. I only would scratch it on the sides
I dont feel no pain or anything even when i push down on it a little to see if it would hurt i dont feel any kind of pain