Photochemotherapy (PUVA) and psoriasis: comparison of 8-MOP and 8-MOP/5-MOP.

Twenty-eight psoriatic patients received PUVA treatment (psoralen and long ultraviolet irradiations. Two preparations were used; 8-methoxypsoralen and a mixture of 5-methoxypsoralen and 8-methoxypsoralen. Both gave considerable improvement, but in 6 cases the lesions reappeared after 2 to 8 weeks, in spite of maintenance treatment. In this report, photochemotherapy of psoriasis was compared, using a UVA emitting lamp, 8-MOP, and a mixture of 8-MOP and 5-methoxypsoralen (5-MOP).