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In page Contact dermatitis:

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Sometimes termed "photoaggravated",[1] and divided into two categories, phototoxic and photoallergic, PCD is the eczematous condition which is triggered by an interaction between a substance on the skin and ultraviolet light[2][3] (320–400 nm UVA) (ESCD 2006), therefore manifesting itself only in regions where the affected person has been exposed to such rays.[citation needed]