Objective: The aim of this study was to investigate the frequency of contact sensitivity in patients with psoriasis, whether there was an association between clinical types and contact sensitivity, whether patch test is a factor that causes Koebner reaction and frequency of contact sensitivity against commonly used topical corticosteroids. Methods: Fifty patients with psoriasis and 50 healthy volunteers were included in this study and 'European standard series' and test units of active ingredients of some corticosteroids were performed on their upper back. The patches were read on hours 24, 48 and on day 7 in order to detect delayed allergic reactions and also Koebner reaction. The results of both groups were compared by using chi-square test. Results: At the end of the patch test allergic reaction was observed in 7 of 50 (14%) patients with psoriasis and 12 of 50 (24%) healthy volunteers. There was no statistically significant difference between allergic reaction of study group and healthy volunteers. There was no statistically significant difference between the clinical types of psoriasis and allergic contact sensitivity. The frequency of reaction increased in individuals having a positive sensitivity history to any substance in both patient and control groups. Reaction to topical steroids was not seen in any patients. Koebner phenomenon due to patch test was also not seen in any patients. Conclusion:We did not show any association between psoriasis and contact sensitivity in this study. We believe that contact allergens should be determined by using patch test in psoriatic patients with a positive history to any substance. Key words: Allergic contact dermatitis contact sensitivity, patch test, psoriasis Amaç: Bu çalışmada psoriasis hastalarındaki alerjik kontakt duyarlılık sıklığının saptanması, hastalığın klinik tipleri ile alerjik kontakt duyarlılık arasındaki ilişkinin belirlenmesi, yama (patch) testin psoriasisi tetikleyen bir faktör olup olmadığının gösterilmesi ve sık kullanılan topikal streoidlere karşı kontakt duyarlılık sıklığının tespit edilmesi amaçlandı.Yöntemler: Çalışmaya 50 psoriasisli hasta ve 50 sağlıklı gönüllü alınarak sırt bölgelerine 'Avrupa standart kontakt alerjen serisi' ve topikal steroid etken maddelerini içeren test üniteleri uygulandı. Yama testi alanları 48., 72. saatte ve hem Koebner reaksiyonu hem de geç reaksiyon oluşturma olasılığını da araştırmak amacıyla 7 gün sonra değerlendirildi. Her iki grup istatistiksel olarak ki-kare testi kullanılarak karşılaştırıldı. Bulgular:Yama testi sonucunda 50 psoriasisli hastanın 7'sinde (%14) kontrol grubunu oluşturan 50 sağlıklı gönüllünün 12'sinde (%24) alerjik reaksiyon izlendi. İki grup arasındaki fark istatistiksel olarak anlamlı değildi. Psoriasis klinik tipleri ile alerjik kontakt duyarlılık arasında istatistiksel olarak anlamlı bir ilişki saptanmadı. Hem hasta hem de kontrol grubunda herhangi bir maddeye duyarlılık öyküsü veren bireylerde reaksiyon görülme sıklığı artmış olarak bulundu. Topikal streoidlere karşı alerjik reaks...
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