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    Photodermatoses in pigmented skin.
    Photochem Photobiol Sci 2013 Jan;12(1):65-77
    Department of Dermatology and Venereology, All India Institute of Medical Sciences, Ansari Nagar, New Delhi-110029, India.
    Photodermatoses are a group of skin diseases primarily caused by, or exacerbated by exposure to ultraviolet and or visible radiation. The effect of sunlight on skin depends on a number of factors including skin colour, skin phototype and the content and type of melanin in the skin. There are only a few studies describing photodermatoses in populations with dark skin. A PubMed search was conducted to summarize currently available information on differences in biology of melanin in dark and light skin and photodermatoses in dark skin. Dark skin is characterised by higher content of melanin, higher eumelanin to pheomelanin ratio, lower tyrosinase activity, and more effective distribution of melanin for protection against ultraviolet light. Photodermatoses are common in dark skinned patients with some variation in the spectrum of photodermatoses. Polymorphous light eruption (PMLE) is the commonest, followed by chronic actinic dermatitis. Pin-point papular and lichenoid variants of PMLE and actinic lichen planus are more frequent in dark skin whereas actinic prurigo, solar urticaria and hydroa vacciniforme are uncommon. Photodermatoses are common in dark skinned patients despite better natural photoprotection. It is proposed that lichenoid photodermatoses may be added to the classification of photodermatoses in dark skin.

    Similar Publications

    A clinical study of the spectrum of photodermatoses in dark-skinned populations.
    Clin Exp Dermatol 2013 Dec 13;38(8):823-9. Epub 2013 Jun 13.
    Department of Dermatology and Venereology, All India Institute of Medical Sciences (AIIMS), New Delhi, India.
    Background: Photodermatoses are characterized by an abnormal cutaneous response to 'ordinary' light exposure.

    Aim: To study the spectrum of photodermatoses in populations with dark skin (skin types IV-VI) at a tertiary referral centre.

    Methods: Consecutive patients with skin lesions confined to or predominantly located on photoexposed parts of the body and/or with photosensitivity were enrolled in the study, and their clinical details were recorded. Read More
    Pinpoint papular polymorphous light eruption in Asian skin: a variant in darker-skinned individuals.
    Photodermatol Photoimmunol Photomed 2009 Apr;25(2):71-4
    National Skin Centre, Singapore.
    Background: Polymorphous light eruption (PMLE) is the most common idiopathic but probably immunologic photodermatosis and has wide morphological variants.

    Methods: The photobiological features of all patients diagnosed with the pinpoint papular variant of PMLE at a tertiary dermatology centre in Singapore over a five-year period were retrospectively examined.

    Results: Twenty-one patients were reviewed from 2003 to 2007. Read More
    Comparison of photodermatoses in African-Americans and Caucasians: a follow-up study.
    Photodermatol Photoimmunol Photomed 2014 Oct 30;30(5):231-6. Epub 2013 Oct 30.
    Wayne State University, School of Medicine, Detroit, MI, USA.
    Background/purpose: Only a few studies have compared frequencies of photodermatoses among different races and skin types. This is an extension of a study performed by Kerr and Lim and evaluates the frequency of photodermatoses in African-Americans compared with Caucasians in the same institution during an 8-year period.

    Methods: Retrospective chart review was performed, including dermatology clinic charts from October 2004 to August 2012 with International Classification of Diseases, Ninth Revision diagnostic codes related to photodermatoses. Read More
    The acute idiopathic photodermatoses.
    Semin Dermatol 1990 Mar;9(1):32-8
    Institute of Dermatology, St Thomas' Hospital, London, England.
    The acute idiopathic photodermatoses are more common in females and comprise polymorphic light eruption, actinic prurigo, hydroa vacciniforme, and solar urticaria. Polymorphic light eruption occurs considerably more frequently than the others and while precise pathogenic mechanisms are still unclear, increasing evidence suggests an immunological basis for this condition. Although clinically distinct, actinic prurigo may be a variant of polymorphic light eruption, whereas solar urticaria and possibly hydroa vacciniforme are distinct entities, the former representing a type I hypersensitivity response. Read More