Narrowband UVB phototherapy is a light treatment that can effectively treat an array of chronic skin conditions including psoriasis, eczema, vitiligo, pruritus (itching), lichen planus and cutaneous T-cell lymphoma. It uses a specific wavelength of ultraviolet radiation, 311 to 313 nm which has shown to provide faster results with less treatments and longer periods of remission. The possible side effects are skin burning similar to a sun burn. If this happens the office should be contacted immediately and a topical steroid may be used. Long term exposure to narrow band UVB may cause skin aging and skin cancers. Treatments are typically three times weekly and length of time exposed to the light increases at each visit until desired affect achieved. The number of treatments needed depends on the patient and their condition.