A Case of Type Ⅳ Solar Urticaria Identified by Reverse in Vitro Serum Test

摘要

We had a 17-year-old male patient with solar urticaria diagnosed as type Ⅳ of modified Harber's classification. The action spectrum of this case was estimated to be 433-499 nm and the inhibition spectrum was 533 nm. Both in vitro serum test and tentatively designated "reverse in vitro serum test" were positive. The patient was prescribed 20 mg/day epinas-tine hydrochloride (Alesion~®) orally for 49 weeks with improvement of the symptoms.