Aquagenic urticaria is a rare condition in which water causes hives. Learn about its symptoms, ... Some material that's dissolved in water passes through the skin and causes an allergic reaction.

The main allergen appears to be prostate-specific antigen (PSA): a protein found in all seminal plasma, not just that of a ...

An immune reaction similar to an allergic reaction that can cause a rash, hives, and itching, with other symptoms as fever, joint pain, and swollen lymph nodes: Erythroderma: Less common: ...

With food allergies on the rise, and hospital admissions tripling in the last 20 years, knowing the right steps could save a ...

Skin reactions can be alarming, especially when they appear suddenly. Many people struggle to tell the difference between hives and a rash, but knowing the cause is the first step toward relief.

It looks almost exactly like regular hives but does not increase a person’s risk for anaphylaxis (i.e., a severe allergic reaction that causes difficulty breathing and swelling of the throat ...