They tend to be localized, although some cases may be generalized (particularly with cholinergic urticaria). The hives ...

Hives — also known as urticaria — is a skin reaction that causes itchy welts that can range from small spots to large blotches. They can be triggered by many situations and substances ...

This rare condition, known as aquagenic urticaria (AU), manifests as hives when the skin comes into contact with water ... Aquagenic urticaria can be confused with other types of urticaria, such as ...