I have a heredity case of Cold Urticaria. We know of four people in my family that have this allergy. My sister has the opposite of this, she breaks out because of the heat (as do I).
I am currently on a new medication called Xyzal. This is not really working for me (Most allergy medications do not, I have gone through Allegera, Claritin, Zyrtec, and have had allergy shots, none of which work).
Because of this allergy I have also been diagnosed with Acute Pernio. Which means that my capillaries aren't moving the right way. It occurs mainly in my feet but has spread to my fingers. My toes start out a light red, but they can become a dark red to purple and blue.
My doctor has told me that this is a rare allergy, however I have seen it pop up more and more lately.
Not only do I have the four family merabers that have this, but one of my frienRAB from a camp I used to go to has this as well. She however can not have really cold fooRAB such as Ice cream and she can not chew on ice, or her throat swells up.
Hopefully others will fare better than I have with this allergy.