Phototherapy is the use of light exposure on the skin to treat a variety of skin diseases, such as psoriasis, eczema, pruritus, lichen planus, cutaneous T cell lymphoma and vitiligo. Patients usually come to the office two to three times a week for treatments and improvement/clearance is seen over the course 12-25 treatments. The therapy may be continued as needed. The patient stands in the center of the lightbox while exposing the affected areas, and wears protective goggles or covers the face entirely. Both broad band UVB and PUVA (psoralen plus UVA) are offered. The risks are minimal but may include a mild burn, tan, and increased risk of skin cancer. This treatment is considered both safe and effective.