I'm not sure about this lately although I was convinced about it. Do grasshoppers sting you (painfully like a bee sting) with their hind legs or are they harmless?
If you're 'thin skinned' or get kicked enough times in the same place, you might bleed a tiny bit. The barbs are similar to a fine coping saw blade, and those suckers can kick hard. I find that it's much more disgusting when they spit on me.
I've never even heard of one that size! The ones we have here range from 1/2" to about 1 1/2". Are you sure you're not thinking of a rabbit?