Phototherapy, or light therapy, is an ultraviolet radiation treatment that consists of exposure to specific wavelengths of light using lasers, LEDs, fluorescent lamps, diachronic lamps, or very bright light, for a certain amount of time.  This type of therapy is used in treating acne vulgaris, seasonal affective disorder, non-seasonal depression, delayed sleep phase syndrome, and psoriasis.  In the treatment of psoriasis in patients that have given up on topical medications because their lesions are to extensive to cure with topical treatment alone, phototherapy a better option.  During phototherapy, the patient’s skin lesions are exposed to ultraviolet light.  This treatment is offered at most dermatology clinics and psoriasis centers. 
The typical lasers used to treat psoriasis are the excimer laser, Psoralen + Ultraviolet Light A (PUVA), and Ultraviolet B (UVB) Phototherapy.

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