• Journal of Photoscience
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• v.9 no.2
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• pp.497-499
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• 2002

We experienced 29 cases of tentative photo allergic disorders from April 2000 to March 2002. For those 29 patients, photopatch tests have been done to explore possible causative photoallergens. We performed photopatch tests with photo-related allergens and possible causative products that the patients brought to us. After applications for 48hrs, one test site was irradiated with half of MRD or 6.0 J/cm$^2$ of UVA. Readings were evaluated according to the reading criteria of the ICDRG. Photoallergens were suggested in 20 cases (69.0%). Among them, we could find out the causative products in 7 cases (24.1%). Photopatch tests, performed by an appropriate method, are useful in some cases not only for diagnosis of photocontact dermatitis but also diagnosis of systemic photoallergic disorders.

• Journal of Preventive Medicine and Public Health
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• v.30 no.1 s.56
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• pp.145-155
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• 1997

Interview survey and dermatological examination have been performed to investigate the health problems of workers continuously exposed to coal-tar pitch. The phototoxicity of coal-tar pitch was confirmed by the photopatch tests for six healthy adults. The main results are followings; 1. There was no special history of allergic diseases in both the exposed and non-exposed group. 2. The frequency of the phototoxic dermatosis and the coal-tar acne in the exposed group was significantly greate.(p<0.05) than that of the control group. In the exposed group, the phototoxic dermatosis and the coal-tar acne were observed in nine workers(90%) and seven workers(70%), respectively. However, those, disease were not observed in the control group. 3. Five results(83%) were positive to the photopatch test for coal-ta. pitch 48 hours after UVA irradiation. But the lesion was subsiding 72 hours after UVA irradiation. 4. Malignant cancers were not reported among workers ever exposed to coal-tar pitch. In conclusion, it appears that workers exposed to coal-tar pitch have high risks of phototoxic dermatosis and coal-tar acne. A health policy should be provided to prevent phototoxic dermatosis among coal-tar pitch workers. More studies are required to determine malignancy.

• Journal of Yeungnam Medical Science
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• v.8 no.1
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• pp.215-219
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• 1991

We report a case of piroxicam-induced photosensitive dermatitis in a 54-year-old female. She had taken oral piroxicam and was exposed to the sunlight on her way home for a few minutes. Several hours after the sun-exposure she developed well-defined, confluent, erythematous plaques and numerous vesicobullae with pruritus and prickling sensation on the sun-exposed areas. A phototest was done on her first visit. The minimal erythemogenic dose(2J/$cm^2$) of ultraviolet(UV) A was markedly decreased whereas that of UVB was within a normal limit. Visible light irradiation for 30 minutes did not cause skin lesions. Six months after the initial skin lesions, a photopatch test with 1% and 10% piroxicam solution followed by UVA(10J/$cm^2$) irradiation showed positive responses on both concentrations.