title: Actinic prurigo: clinical features and prognosis.
abstract: BACKGROUND
  Actinic prurigo, an idiopathic familial photodermatosis, has been described in Amerindians in Manitoba, Canada, as well as in the United States, Mexico, and South America.
  
  
  OBJECTIVE
  Our purpose was to describe the clinical features and prognosis of actinic prurigo in Amerindians in Saskatchewan, Canada.
  
  
  METHODS
  Clinical examinations, questionnaires, phototesting, and laboratory tests were used.
  
  
  RESULTS
  We present a series of 93 Amerindian patients. The face is the most commonly involved area. A hereditary tendency, cheilitis, and pruritus are prominent features. One third of patients report some lesions, often minor, during the winter. The majority of patients phototested were sensitive to ultraviolet A light.
  
  
  CONCLUSIONS
  We find the age of onset of actinic prurigo to be the most important feature in determining the type of eruption and the prognosis for the patient. In general the younger ages of onset (up to 20 years of age) are associated with cheilitis and more acute eruptions and are more likely to improve over 5 years. Those who develop actinic prurigo as adults (21 years of age and older) tend to have a milder and more persistent dermatosis.
authors.affiliation: Division of Dermatology, University of Saskatchewan, Saskatoon, Canada.
authors.forename: P R
authors.initials: PR
authors.lastname: Lane
authors.forename: D J
authors.initials: DJ
authors.lastname: Hogan
authors.forename: M J
authors.initials: MJ
authors.lastname: Martel
authors.forename: B
authors.initials: B
authors.lastname: Reeder
authors.forename: J
authors.initials: J
authors.lastname: Irvine
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000704:Analysis of Variance; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007198:Indians, North American / Q000706:statistics & numerical data; D008297:Male; D008875:Middle Aged; D010787:Photosensitivity Disorders / Q000175:diagnosis* / Q000453:epidemiology; D011379:Prognosis; D011536:Prurigo / Q000175:diagnosis* / Q000453:epidemiology; D012525:Saskatchewan / Q000453:epidemiology; D013472:Sunlight / Q000009:adverse effects; D011795:Surveys and Questionnaires