I have it parts of my body that are exposed often. Legs and arms (shorts and t shirts).
It is rsd related according to Dr K.
Try using something like Eucerin, it's VERY soothing.
If you need something stronger, get something with cortisone in it, Aveeno just came out with a cream with cortisone, it's very nice.
(I'm getting over an attack from a spider, I have more than 100 bites, on my right calf.
So, I've just been through the whole steroid thing, with lots of anti itch lotion. I got lots of hives, and that has never really happened to me before..

Hope that helps, stop scratching, or you'll make permanent spots!
Rubbing a good cream or lotion will gently relieve the itch! I've got a couple nasty little scars from this...
(There goes my career as a leg model!)

Pete