title: Photocontact dermatitis to cobalt salts.
abstract: 4 patients with chronic photocontact dermatitis were sensitive to cobalt salts. They presented as cases of contact dermatitis from cement or pig fodder with persistent lesions on exposed areas. Only 2 of them had standard patch test positive reactions to chromate and cobalt, but all showed positive photo-patch tests to cobalt. Photo-oxidation tests proved that cobalt salts are photosensitizing. Exposure to cobalt salts was responsible for the patients' chronic actinic dermatitis.
mesh_terms: D000328:Adult; D000368:Aged; D000821:Animal Feed / Q000009:adverse effects*; D000818:Animals; D003035:Cobalt / Q000009:adverse effects*; D003252:Construction Materials / Q000009:adverse effects*; D009783:Dermatitis, Occupational / Q000209:etiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010328:Patch Tests; D010787:Photosensitivity Disorders / Q000209:etiology*; D013030:Spain; D013552:Swine
chemical_list: D003035:Cobalt; C025913:cobaltous nitrate; C018021:cobaltous chloride; C027875:cobaltous sulfide