[Treatment of solar urticaria by intravenous immunoglobulins and PUVA therapy].

BACKGROUND: Solar urticaria is a rare form of urticaria occurring a few minutes after solar exposure. It is particularly incapaciting because it limits outdoor activities. Antihistamine and phototherapy are sometimes disappointing. CASE REPORT: A 32 Year-old woman had been suffering from severe solar urticaria since November 2000, which was confirmed by photobiological data. High-dose antihistamine treatment (fexofenadine 180 mg twice a day) was inefficient. Despite a first UVA desensitization, PUVAtherapy produced only a partial improvement and short lasting for protection, with an important handicap in daily life. In March 2002, among the others treatments, we chose intravenous immunoglobulins: 0.5 g/kg the first day then 1 g/kg the second and the third days. The minimal urticaria dose was raised from 1 J/cm2 in UVA before perfusion up to 15.6 J/cm2 48 hours later and in UVB from 100 mJ/cm2 up to 2,200 mJ/cm2. Clinically the improvement was significant but partial in daily activities. It was possible to reintroduce PUVAtherapy without UVA-desensitization and, for the first time, to obtain complete remission for more than 2 Months with an association of intravenous immunoglobulins, PUVAtherapy and antihistamine treatment. In July 2002, treatment was successfully repeated. DISCUSSION: First intention treatments (antihistamine and PUVAtherapy) are sometimes inefficient. Others treatments (plasmapheresis, ciclosporin, doxepin, cimetidine) are restrictive, not always efficient and can induce severe side-effects. We report the second case of solar urticaria improved by intravenous immunoglobulins. In spite of the cost, intravenous immunoglobulins seem to be an interesting treatment, at least by avoiding UVA-desensitization in severe cases of solar urticaria.