These aren't really injuries, but
when I was 12 my friend and I were hit by a car on our way home from school. We were fine though, aside from some fairly large bruises on our legs and she lost half a tooth.
Also I'm allergic to horseflies, which isn't dangerous, but the bites swell up really bad. One time I was bitten on the back of my hand and it looked like if you filled a rubber glove with water. And a little over a year ago we went riding and I somehow got 5 bites on one leg and none anywhere else. The whole leg was swollen and it hurt for weeks