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History of psoriasis response to sunlight does not predict outcome of UVB phototherapy

We prospectively asked 146 consecutive patients starting narrow‐band UVB (NB‐UVB) for psoriasis about the effects of sunlight on their psoriasis. Eighty‐eight (60%) patients reported improvement with sunlight, six (4%) reported worsening, and 52 (36%) had not noted any change in their psoriasis with sunlight exposure. Overall, 101 (69%) were recorded to reach clearance or minimal residual activity (MRA), 24 (16.5%) to achieve moderate improvement, and 21 (14.5%) had other recorded outcomes (mainly ‘did not attend’), with UVB phototherapy. Forty‐two (72%) of the 58 who did not report improvement with sunlight went on to clearance/MRA with UVB compared to 59/88 (67%) of those who did report improvement (95% confidence interval for difference in percentage improving, −10% to 20%, P = 0.49). Patients' replies to questions about how their psoriasis responds to sunlight do not appear to predict response to UVB phototherapy in our patient population.