photodermatosis

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photodermatosis (foh-toh-der-mă-toh-sis) n. any of various diseases caused by exposure to light of varying wavelength (see photosensitivity). The face and neck are most commonly affected. A common photodermatosis is polymorphic light eruption, which appears with the first sunshine of spring and abates by late summer. The photodermatoses include certain porphyrias.