Which physical findings are characteristic of urticaria?

Updated: Mar 21, 2018
  • Author: Henry K Wong, MD, PhD; Chief Editor: Michael A Kaliner, MD  more...
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Answer

Lesions of urticaria can be polymorphic and vary from several millimeters to large, continuous edematous plaques that have smooth surfaces with polycyclic curved borders. The lesions do not have scales but show an intense erythema in the newest areas, with a trailing clearing region in older areas. The central clearing can cause a target configuration in expanding plaques. The advancing border shows a discrete edge followed by a faint, trailing, diffuse border.


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