Editing Ultraviolet (section)

====Therapy====
{{main|Ultraviolet light therapy}}
Ultraviolet radiation is helpful in the treatment of [[skin conditions]] such as [[psoriasis]] and [[vitiligo]]. Exposure to UVA, while the skin is hyper-photosensitive, by taking [[psoralen]]s is an effective treatment for [[psoriasis]]. Due to the potential of [[psoralens]] to cause damage to the [[liver]], [[PUVA therapy]] may be used only a limited number of times over a patient's lifetime.

UVB phototherapy does not require additional medications or topical preparations for the therapeutic benefit; only the exposure is needed. However, phototherapy can be effective when used in conjunction with certain topical treatments such as anthralin, coal tar, and [[vitamin A]] and D derivatives, or systemic treatments such as [[methotrexate]] and [[Soriatane]].<ref>
{{cite web |title = UVB Phototherapy |url = http://www.psoriasis.org/treatment/psoriasis/phototherapy/uvb.php |archive-url=https://web.archive.org/web/20070622180124/http://www.psoriasis.org/treatment/psoriasis/phototherapy/uvb.php |archive-date=22 June 2007 |format=php |access-date=2007-09-23 |publisher=National Psoriasis Foundation, USA}}</ref>