Thanks...I don't think it's dermagraphism, as it's not raised at all. There's a very slight redness perhaps, but nothing at all dramatic. It looks almost normal...it just really itches.
Hard to say if it's pressure-related. For sure, when it happened to my hands, my palms were pushing heavily on the ground supporting my weight. On the other hand, the wetsuit boot episode didn't really involve a lot of pressure I don't think...mind you, it was definitely a tight fit, so....???
My dermagraphism only raises slightly on stomach and thighs. but on my hands, feet, neck etc it just gets itchy and red. The best way to tell is to try scratching yourself with a bit of pressure and see if you can write on your arm (it will turn red). Also, try taking an antihistamine and see it stops happening. If that works it could have been brought on by environmental or food allergies, so hopefully you can eliminate whatever is causing it. Pressure often sets it off for me. I cannot think of anything else that would cause your symptoms that I am aware of! Good luck and I hope you get some answers!