My husband (38 years old) was diagnosed with congestive heart failure 4 years ago. The last couple of days, he has started getting hives when he goes outside in the cold air (we live in Michigan, always have). It is only the exposed area of his skin and it goes away within a few minutes of getting warm. Should he talk to his cardiologist about this? Is it something that could be serious? I have read that it could be cold urticaria, but I don t know how serious that is for someone with his condition.