title: Report of a persistent light reaction due to pitch.
mesh_terms: D006801:Humans; D008297:Male; D008875:Middle Aged; D010328:Patch Tests; D010787:Photosensitivity Disorders / Q000175:diagnosis / Q000209:etiology*; D013638:Tars / Q000009:adverse effects*
chemical_list: D013638:Tars