Narrow-band UVB (NB-UVB) therapy stands as an effective and well-tolerated second-line treatment for chronic urticaria (COU). It offers subjective relief from itching and hives, along with objectively reducing the occurrence of hives. However, conducting more extensive studies with extended follow-up periods is imperative to ascertain the appropriate clinical response and potential long-term complications of this therapy in managing COU.

Citation: Aydogan K, Karadogan SK, Tunali S, Saricaoglu H. Narrowband ultraviolet B (311 nm, TL01) phototherapy in chronic ordinary urticaria. Int J Dermatol. 2012 Jan;51(1):98-103. doi: 10.1111/j.1365-4632.2011.05056.x. PMID: 22182386.