Hi, The best thing to do when bitten is to wash the area with soap and water, this should kill of the infections they leave.
the swelling will go in about 3/4 days nothing much you can do about it, you could try creams but there not much use, just notch it up to experience.
I was just bite an hour ago, but I knew to wash the area quickly.
The thing with these fly's is they don't have pointers or stingers, they bite with a row of teeth like biters.
it is always the female as the male has no mouth
The reason they do it is to feed there young.
another reason why you should wash quickly is because they can lay eggs in you.
DON@T PANIC it is rare....
In Future stay away from the hedges or high grass
If your doing like i was cutting the grass then cover all the skin as well as possible.
Saying that this little bugger bite through my garden glove...
but of course the repellant would do the trick
so for now just use something cold on the itch.