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  • Title: 7 years experience of photopatch testing with sunscreen allergens in Sweden.
    Author: Berne B, Ros AM.
    Journal: Contact Dermatitis; 1998 Feb; 38(2):61-4. PubMed ID: 9506215.
    Abstract:
    Since 1990 7 sunscreen allergens have been included in the standard photopatch protocol at 2 Swedish dermatology clinics. 355 consecutive patients with suspected photosensitivity were tested, and in 28 of these (7.9%), a total of 42 allergic reactions were found. 80% of the reactions were of photocontact origin. The most common allergen was benzophenone-3 (Eusolex 4360), with 15 photocontact and 1 contact allergic reactions, followed by isopropyl dibenzoylmethane (Eusolex 8020) (8 photocontact, 4 contact) and butyl methoxydibenzoylmethane (Parsol 1789), with 6 photocontact reactions. There were 2 cases of photocontact allergy to phenylbenzimidazole sulfonic acid (Eusolex 232), which has not been reported previously. 1 case of contact urticaria from benzophenone-3 was accidentally found. In addition, 21 + reactions of doubtful relevance were noted in 14 patients: 16 on irradiated and 5 on non-irradiated test sites. Among these, irritant and phototoxic reactions may be included. These results indicate that the inclusion of UV filters in the standard photopatch protocol is important. Immediate-type testing for urticaria could also be of value.
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