RT Book, Section
A1 Clark, Matthew
A1 Gudjonsson, Johann E.
A2 Kang, Sewon
A2 Amagai, Masayuki
A2 Bruckner, Anna L.
A2 Enk, Alexander H.
A2 Margolis, David J.
A2 McMichael, Amy J.
A2 Orringer, Jeffrey S.
SR Print(0)
ID 1161328461
T1 Pityriasis Rosea
T2 Fitzpatrick's Dermatology, 9e
YR 2019
FD 2019
PB McGraw-Hill Education
PP New York, NY
SN 9780071837798
LK accessmedicine.mhmedical.com/content.aspx?aid=1161328461
RD 2024/04/19
AB AT-A-GLANCECommon  self-limited  papulosquamous  eruption  typically  lasting  5  to  8  weeks.Occurs  worldwide  in  all  races  and  age  groups,  with  peak  incidence  between  the  ages  of  10  and  35  years.Classically  begins  as  an  isolated  3-  to  5-cm  oval  plaque  on  the  trunk  with  a  collarette  of  fine  scale  just  inside  the  periphery,  which  plaque  is  called  a  herald  patch.This  is  followed  by  a  secondary  eruption  of  similar  appearing  but  smaller  lesions  on  the  trunk  and  proximal  extremities,  usually  with  their  long  axis  along  the  lines  of  cleavage.Many  atypical  variants  exist  in  contrast  to  the  pattern  described  above.Pityriasis  rosea  can  have  associated  systemic  symptoms  and  pruritus,  but  many  cases  are  asymptomatic.Etiology  is  unknown,  but  it  is  thought  to  be  a  viral  exanthem  most  likely  related  to  infection  or  reactivation  of  human  herpesvirus  (HHV)-6  and/or  HHV-7.Usually  only  supportive  treatment  and  reassurance  is  needed,  but  for  severe  cases  acyclovir  may  hasten  recovery  and  lessen  symptoms.