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urticaria URT... - Coggle Diagram
urticaria 
Clinical manifestations
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Wheals, appear as a rash on the skin
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Pathophysiology
This results in intradermal edema caused by capillary and venous vasodilation and occasionally caused by leukocyte infiltration
The release of histamine, bradykinin, kallikrein, and other vasoactive substances from mast cells and basophils in the superficial dermis.
Definition
Also known as hives, are a red, raised, itchy skin rash that is sometimes triggered by an allergen
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Types
Acute urticaria can be caused by foods, colourings, preservatives or by medicines, especially aspirin, antibiotics, and codeine
Chronic, which can last in excess of 6 weeks
References
Poonawalla T, Kelly B. Urticaria : a review. Am J Clin Dermatol. 2009. 10(1):9-21. [Medline]
Frigas E, Park MA. Acute urticaria and angioedema: diagnostic and treatment considerations. Am J Clin Dermatol. 2009. 10(4):239-50. [Medline]