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Phototherapy involves exposing the skin to wavelengths of ultraviolet light under medical supervision. This is a standard treatment for patients with moderate to severe psoriasis who have not responded to topical therapies. It also may be used for patients whose psoriasis is extensive or disabling.

Treatment usually takes place in a doctor's office or a psoriasis day clinic, although this option is becoming rare.

UVB: This type of treatment involves exposing the skin to ultraviolet light B (UVB). It is a common, safe and very effective treatment, and generally works best when the psoriasis plaques are thin.

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