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Definition Acute and chronic urticaria, which involve the dermis, are caused by the excessive release of histamine from mast cells—sometimes acute and sometimes chronic, and sometimes with and sometimes without a trigger. Angioedema, which also involves subcutaneous tissue, can accompany…
Synonyms ▪ Wheals – hives, nettle rash ▪ Angioedema – Quincke edema, angioneurotic edema Key features ▪ Urticaria is characterized by transient skin or mucosal swellings due to plasma leakage. Superficial dermal swellings are wheals, and deep swellings of the…