<unk>  (essentially meaning<unk>  hives) is a disorder where hives<unk>  or large red welts form on the skin after exposure to a<unk>  stimulus. The welts are usually itchy and often the hands and feet will become itchy and swollen as well. Hives vary in size from about in diameter to as big as about or larger. This disorder, or perhaps two disorders with the same clinical manifestations, can be inherited (familial<unk>  or acquired (primary acquired<unk> . The acquired form is most likely to occur between ages 18–25, although it can occur as early as 5 years old in some cases. Life-threatening risks include suffocation resulting from pharyngeal angioedema induced by<unk>  foods or beverages, drowning after shock from swimming in<unk>  water and anaphylactic shock.
Cold urticaria
Heat urticaria
Solar urticaria
Pressure urticaria
Aquagenic urticaria
Physical urticaria
Cholinergic urticaria
Delayed pressure urticaria