the rapid appearance of erythematous, often itchy, swellings are characteristic
urticaria can be localised or generalised (1)
may take the form of blotches, blisters, or wheals varying in size and shape
are transient and usually disappear within a few hours.
sites of constriction by clothing are common sites
systemic reactions cannot be seen in most of the patients but on rare occasions allergic and some physical urticarias may develop into anaphylaxis. Note though that urticaria is a frequent finding in anaphylactic and anaphylactoid reactions (2)
an acute urticaria rash may cover most of the skin surface
in chronic urticaria, only a few wheals appear each day
angioedema presents in the lips, genitalia and hands; it is life-threatening if the tongue and larynx are affected
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