Long-term local trioxsalen photochemotherapy in psoriasis.

Good results were achieved in psoriasis with trioxsalen baths and UVA in 92% of 158 patients during initial treatment and in 83% of 139 patients during long-term treatment. Grade I-II local burns were encountered in about 7% of the patients. In addition, itchy skin pain was experienced by 2 patients, and in both of these the therapy was discontinued. Neither skin malignomas nor other serious side effects were seen.