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| Alternative Names: | Urticaria
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| Symptoms: | - Itching
- Swelling of the surface of the skin into red or skin colored welts (wheals) with clearly defined edges
- Sudden onset
- Rapid resolution
- Welts turn white when pressed
- Welts enlarge, spread, or join together to form large flat raised areas
- Welts change shape, disappear and reappear within minutes or hours
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| Signs and tests: | The diagnosis is primarily based on the appearance of the skin, especially if the patient has a history of reacting to an allergen. Occasionally, skin or blood tests may be performed.
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Review Date: 4/17/2003
Reviewed By: Michael Lehrer, M.D., Department of Dermatology, University of Pennsylvania Medical Center, Philadelphia, PA. Review provided by VeriMed Healthcare Network.
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