RT Book, Section
A1 Dawe, Robert S.
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 1161327257
T1 Actinic Dermatitis
T2 Fitzpatrick's Dermatology, 9e
YR 2019
FD 2019
PB McGraw-Hill Education
PP New York, NY
SN 9780071837798
LK dermatology.mhmedical.com/content.aspx?aid=1161327257
RD 2024/04/24
AB Many  diseases  are  caused  by  abnormal  responses  to  ultraviolet  radiation  (UVR)  and  visible  light  exposure.  This  textbook  includes  separate  chapters  on  other  idiopathic  (usually  presumed  immune-mediated)  photodermatoses,  including  polymorphic  light  eruption/polymorphous  light  eruption  (PLE/PMLE),  actinic  prurigo,  hydroa  vacciniforme  (HV),  and  solar  urticaria,  and  photodermatoses  as  a  manifestation  of  metabolic  diseases  such  as  the  cutaneous  porphyrias.  This  chapter  discusses  conditions  with  a  dermatitis  on  exposed  sites,  whether  or  not  covered  sites  are  also  affected.  These  conditions  include  chronic  actinic  dermatitis,  photoallergic  contact  dermatitis,  drug-induced  photosensitivity,  and  manifest  as  a  dermatitis  (eg,  caused  by  thiazides)  and  photoaggravation  of  other  dermatitides  (atopic  eczema,  seborrheic  dermatitis,  and,  often  when  caused  by  an  airborne  allergen,  allergic  contact  dermatitis).  Frequently,  clinical  assessment  alone  is  insufficient  to  distinguish  between  true  abnormal  cutaneous  photosensitivity  (as  in  chronic  actinic  dermatitis)  and  photoaggravation,  not  true  photosensitivity,  of  another  dermatitis,  and  investigation  with  some  form  of  phototesting  can  be  necessary  for  definitive  diagnosis,  with  important  implications  for  management.