Any questions: Ultraviolet light for psoriasis

Where does the balance of advantage lie in the effect of ultraviolet light for people with psoriasis?

Approximately 80% of people with psoriasis will observe that their psoriatic plaques are improved by exposure to natural sunlight, 10% notice no difference, and 10% report deterioration. This observation has led to the widespread use of artificial ultraviolet radiation as one method of treating psoriasis either singly or in combination. Broad band ultraviolet B (290-320 nm) has been widely used for many years either as monotherapy or …