113 psoriatic patients were treated with SUP combined with 0.1-0.3 per cent cignoline. The lamps produced by Heraeus were used, in 48 patients--Psorilux 3060 and in 65--Psorilux 5050. The first symptoms of improvement were visible after 7-10 days. The mean duration of the treatment was 4 weeks. In 46 per cent of the patients psoriatic eruptions disappeared completely and in the further 44 per cent ones a considerable improvement was observed. The better results were obtained in patients irradiated with lamp of greater power and in those, who received a greater number of irradiations. Severe side effects were observed only in 2 cases. Selective ultraviolet phototherapy was found to be a useful method in the treatment of psoriasis.