Yes, sounds about right. Its very much like hives only it affects a deeper skin layer. Anything will bring on an attack. For example, if I wear a pair of shoes that I've worn many times before but haven't worn in a while they might rub, say, the top of a foot and later I'm itching, the skin is swelling like a ball park frank, and it is hot to the touch. I imagine it feels like fire ants biting. I've been rendered almost unable to walk. It usually affects extremities (my ear has swollen shut on occasion.) There is a version called Hereditary Angioedema that can be dangerous: closing off your airways. I don't do that!
Oh, and it typically develops in early 20s. I was in college when it started.
I had to tell mammo lady that I wasn't diseased and had scratched my arm in my sleep. I told my mom I got a kitten.
