Abstract
The way by which light plays a role in photo-eruptions varies among disorders. Some eruptions such as solar urticaria, polymorphous light eruption (PMLE), photo-contact dermatitis, and photo-drug eruption require a specific dose of ultraviolet exposure in order to induce the eruption. Other disorders such as lupus and dermatomyositis usually occur without a specific exposure of light exposure but may be exacerbated by ultraviolet light exposure.
The clinical manifestations of porphyria require chronically sun-exposed skin in order to manifest lesions. Chronic actinic dermatitis is heterogeneous. Some patients have preexisting dermatitis that is exacerbated by light (so-called photosensitive eczema). Others have an eruption that is initiated by light exposure either in the presence of photo-sensitizing drug but that persists after discontinuing the medication (persistent light reaction) or without a medication (actinic reticuloid).
There are as many histological types of photo-eruptions as there are clinical types.
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© 2015 Springer International Publishing Switzerland
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Mutasim, D. (2015). Photo-Eruptions. In: Practical Skin Pathology. Springer, Cham. https://doi.org/10.1007/978-3-319-14729-1_28
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DOI: https://doi.org/10.1007/978-3-319-14729-1_28
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Publisher Name: Springer, Cham
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Online ISBN: 978-3-319-14729-1
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