Photoallergic contact dermatitis is uncommon

@article{Darvay2001PhotoallergicCD,
  title={Photoallergic contact dermatitis is uncommon},
  author={Amrit Darvay and Ian R. White and Richard J. G. Rycroft and A. B. Jones and John L. M. Hawk and J.P. Mcfadden},
  journal={British Journal of Dermatology},
  year={2001},
  volume={145}
}
Background Despite the enormous increase in sunscreen use, allergic contact (AC) and photoallergic (PA) reactions to ultraviolet (UV) filters are considered rare. 
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The aim of this study was to investigate contact allergens and photoallergens in sunscreens commercially sold on the shelves of supermarkets and pharmacies in New Zealand.
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Photoprotection including sunscreen use in children is encouraged by health campaigns, but limited data are available in children and contact reactions in adults.
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TLDR
The epidemiology and clinical characteristics of sunscreen allergy are summarized in this review and a detailed discussion of specific chemical sunscreen allergens is provided.
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TLDR
The aim of the present study was to determine the incidence of photoallergic contact dermatitis in the centre and to identify common photoallergens, important for patient selection and formulation of the appropriate photopatch test series.
Investigation of photosensitive disorders
  • G. Murphy
  • Medicine
    Photodermatology, photoimmunology & photomedicine
  • 2004
Investigation of photodermatosis is based primarily on the history and clinical findings, histological, immunological and biochemical findings are variably helpful depending on the clinical picture.
Photopatch testing in Bogota (Colombia): 2011–2013
Photopatch tests are used to diagnose photoallergic contact dermatitis and identify the causal agents. The frequencies of positive results and associated allergens vary by country; therefore, it is
Photopatch testing of 1155 patients: results of the U.K. multicentre photopatch study group
TLDR
The most common U.K. photoallergens appear to be sunscreen chemicals, and the investigation of choice is photopatch testing (PPT), which is probably underused.
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Positive patch test reactions were demonstrated some years after the initial diagnosis and after significant maintained improvement of the photodermatosis had occured.
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Results, obtained from January 1990 to December 1994, confirm that, given the high frequency of photosensitization cases, a large part of the battery of photopatch tests should be dedicated to sunblocks.
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The cases of four individuals with photoallergy to oxybenzone in sunscreens are reported, likely that such reactions will become more commonplace since oxyben Zone is by far the most frequently used agent in modern, high sun protection factor sun screens being marketed today.
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The association between Compositae (sesquiterpene lactone) dermatitis and CAD is confirmed, with neither detectable contact nor photocontact allergy, nor a preceding history of endogenous eczema.
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In 13 of the 16 patients in whom a biopsy was carried out, the histology supported the clinical diagnosis, and in none of the biopsies was the picture diagnostic in itself, underlines the inadequacy of light microscopy as the only diagnostic procedure.
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TLDR
The principal photoallergens and contact allergens in the PLE, persistent light reaction and actinic reticuloid groups are discussed, together with the problems, risks and possible mechanisms of induction of photosensitization in patients with suspected photodermatosis.
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The text is well-referenced and contains a more comprehensive discussion of the formulation and individual ingredient cutaneous reactions due to cosmetics than Fisher's standard text ( Contact Dermatitis).
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