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2428 pages added, reviewed or updated during the last month (last updated: 23/4/2021)

2428 pages added, reviewed or updated during the last month (last updated: 23/4/2021)


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polymorphic light eruption

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Polymorphic light eruption is a common idiopathic photosensitive disorder which is frequently mis-diagnosed with miliara ("prickly heat"). It occurs in about 10-20% of the population with females affected more frequently than males in the ratio of 6:1. Presentation is usually in late adolescence and young adulthood, often early in the summer following exposure to ultraviolet (A and B wavelengths).

  • intermittent eruption of non-scarring, erythematous itchy papules, plaques or vesicles induced by UV irradiation of sun-exposed skin
  • face, neck, and the upper and lower extremities are most commonly involved
  • symptoms are worse in spring and early summer

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Last reviewed 09/2020

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