Urticaria differential diagnosis

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

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Differentiating Urticaria from other Diseases

• Hereditary or acquired deficiency of complment factor C1
• Malignancy
• Poison ivy contact dermatitis

The rash that develops from poison ivy, poison oak, and poison sumac contact is commonly mistaken for urticaria. This rash is caused by contact with urushiol and results in a form of contact dermatitis called Urushiol-induced contact dermatitis. Urushiol is spread by contact, but can be washed off with a strong grease/oil dissolving detergent and cool water.