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Image Number 763 (Urticaria)

 
Morphology:
Red,nonscaly

Diagnosis: Urticaria

Site: Thigh

Sex: M

Age: 5

Type: Clinical

Description: Urticarial hives

Submitted by: Shahbaz Janjua

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Differential Diagnosis

History:

Urticaria usually presents as raised, erythematous wheals accompanied by intense pruritus. The lesions typically last a few hours, only to fade and reappear elsewhere.  Urticaria may be classified as either acute or chronic. Typically, lesions lasting less than 6 weeks are referred to as acute urticaria. Acute urticaria is more common in young people and is most likely due to exposure to food allergens , food additives, certain medications, or radiocontrast media. Certain antibiotics may produce acute urticaria by either IgE- or IgG-mediated mechanisms(referred to as Arthus phenomenon). 



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