ficacy of oral PUVA and PUVA water bath for the treatment of moderate to severe chronic plaque psoriasis, that there was no significant difference in the therapeutic effect of three, but the water required for PUVA treatment time and remission should be longer than that of UVB. They think that the bath PUVA has less UV related side effects, and remission period longer, but specific to the clinical practical application to determine what phototherapy according to treatment and reactions of patients before the. Some scholars studied after oral administration of 8-MOP UVB (PUV irradiation in the treatment of psoriasis curative effect, the results showed that PUVB and PUVA are equally effective, but the cumulative dose of UVB needed to small [23], however, now PUVB has not been widely applied.
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