Photopatch test results of the North American contact dermatitis group, 1999-2009.

Photoallergic contact dermatitis (PACD) is an unusual but not rare form of photosensitivity with an etiology similar to that of allergic contact dermatitis (ACD), with the added requirement of concomitant exposure to ultraviolet (UV) light.1 Photopatch testing (PPT) is a critical tool for diagnosing PACD. There are only a few large studies of photoallergens from North America.2-4 We present a retrospective analysis of North American Contact Dermatitis Group (NACDG) PPT results from 1999-2009.