Bug Identification Needed

[klo3]

Today around 10:30 am I went to sit on a bench at my school. I was wearing jeans, and right as I sit the back of my leg became to feel instantly on fire, and throbbing in pain, worse than a wasp sting I'd say. I jumped off, and saw something I hadn't seen before, it had instantly died right as it "stung" me. It is still sensitive to the touch, and throbs, and stings terribly. I have tried ointments the nurse gave me but it doesnt work.
could someone tell me what this is please???
I've been searching and can't seem to find any answers,
thanks.

[Darby]

It looks like some kind of abdomen, from the small thoracic connection I'd guess a wasp.