Allergies urticaria?

I know someone who has these allergy(urticaria) for a while(for about 4 months)and it doesn't wanna go away.She went to several dermatologists and took several medications,but still it doesn't go away.Every morning She wakes up ,she has this urticaria.We don't even know the cause of it.Any idea about what should we do?Or what might be the cause of urticaria?

It could be dermatographism. The cause is unknown. There is no cure, but this is not a life-threatening condition. Source(s): http://www.healthy-skincare.com/dermatog...

What does her allergist say? I assume she had allergy testing done?

Most times the doctor can't figure out what the allergy is in a case like that..

I know someone who keeps having hives.. in her throat! She was on steroids and everything else.. allergy testing came back negative for everything.
Yes, it is possible to be allergic to the cold. In some people, cold temperatures trigger the release into the skin of histamines and other chemicals made by the immune system. The cause isn't clear. But some people appear to have overly sensitive histamine-containing skin cells.

Signs and symptoms of a "cold allergy" 鈥?also called cold urticaria 鈥?include:

Skin redness
Itching
Hives (urticaria)
Swelling