RT Book, Section
A1 Weinberg, Samuel
A1 Prose, Neil S.
A1 Kristal, Leonard
SR Print(0)
ID 6988156
T1 Section 13. Urticarial, Purpuric, and Vascular Reactions
T2 Color Atlas of Pediatric Dermatology, 4e
YR 2008
FD 2008
PB The McGraw-Hill Companies
PP New York, NY
SN 978-0-07-145543-5
LK accesspediatrics.mhmedical.com/content.aspx?aid=6988156
RD 2024/04/18
AB A  wheal  is  an  edematous  papule  that  may  enlarge  to  form  a  pink,  sharply  circumscribed,  elevated  plaque.  The  typical  lesions  of  urticaria,  pictured  here,  have  a  suggestion  of  central  clearing.  By  definition,  the  individual  lesions  of  urticaria  evolve  quickly  and  resolve  within  24–48  hours.  They  are  usually  accompanied  by  severe  pruritus.  The  most  common  etiologies  of  urticaria  are  medications,  foods,  and  viral  (Fig.  13-2)  and  bacterial  infections.  Autoimmune  disease  and  malignancy  are  extremely  rare  causes.  In  the  child  with  chronic  urticaria,  it  is  often  difficult  or  impossible  to  identify  a  single  cause.