While narrowband ultraviolet light-B (NB-UVB) has become integral to the treatment of diffuse vitiligo, evidence-based guidelines have been lacking with regard to dosing and administration. This is largely the result of heterogeneous study designs, ambiguous methodologies, disparate dosing strategies and the use of varied, and somewhat arbitrary, outcome measures. In the absence of prospective trials to address each of these concerns, the available literature regarding the application of NB-UVB for vitiligo was reviewed and the authors now pose a set of questions to the phototherapy community in an attempt to highlight gaps within our understanding. We aim to stimulate discussion, elicit expert opinion and identify areas for future research in order to move toward a unified and safe treatment guideline for patients afflicted by this disease. This article is protected by copyright. All rights reserved.
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