DH is supposed to be INSANELY itchy and lasts and lasts long after exposure to gluten. Scabs form over the water-filled hives as you scratch even in your sleep. Folks get scars from scratching.
Allergies affecting the skin can be itchy, but I do not think they would be in the insane category. I get hives from the cold that wheal up and itch, but they resolve quickly as do some of my reactions from meds. An antihistamine usually does the trick. Nothing seems to help DH except for strict avoidance.
Thank you!! This is exactly what I wanted to know.