Narrowband UVB is a form of phototherapy that works by treating the skin with a narrowband of ultraviolet radiation. In comparison to broadband UVB, the treatment is more intense but the exposure and treatment times are shorter, it is more likely to clear the skin condition and longer periods of remission are likely to occur between treatments.

Patients attend phototherapy two to five times per week. Treatments can be whole body or localised and the amount of UV is carefully monitored by staff.

It is particularly effective for the treatment of psoriasis and eczema and for a range of other conditions.

There may be some side effects to the treatment including burning. Long term exposure to narrowband UVB may also cause skin to prematurely age and skin cancers.

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