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Itch and scratching as predictors of time to clearance of psoriasis with narrow‐band ultraviolet B therapy

Background  Narrow‐band ultraviolet (UV) B phototherapy is an effective treatment for psoriasis. However, there is considerable variability in the number of treatment sessions needed to achieve psoriasis clearance. While several clinical and treatment‐related factors predict time to clearance, the effect of itching and scratching on the number of irradiation sessions is insufficiently understood.