Under a dermatologist’s care, light therapy may provide safe and effective treatment for many patients with psoriasis. Because too much ultraviolet (UV) light can make psoriasis worse, it is important to see a dermatologist for treatment. Never try to self-treat by using a tanning bed or sunbathing.
Before prescribing light therapy, a dermatologist will meet with a patient. Light therapy is not for everyone as in some cases the skin is too sensitive or some patients cannot spare the time that light therapy requires. Usually, several treatments are required and the patient must go to a dermatologist’s office, psoriasis center, or hospital for the treatments. If light therapy is appropriate for a patient, the dermatologist may prescribe one of the following:
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Laser Therapy
A laser can target the psoriasis and not touch the surrounding skin. Because the light treats only the psoriasis, a strong dose of light can be used. This offers many people an effective way to treat a stubborn patch of psoriasis, such as on the scalp, feet, or hands.
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Ultraviolet B (UVB) Light
To receive this therapy, a patient stands in a light box or in front of a light panel. If the psoriasis responds, about 24 treatments over a 2-month period should clear the psoriasis. Although UVB is safe and effective, it does have possible side effects. These include burns, freckling, and premature skin aging. A patient’s risk of developing skin cancer appears to be about the same as a lifetime of going out in the sun without sun protection. The dermatologist and the patient will weigh the risks, and dermatologists will closely monitor their patients for skin cancer.
When light therapy is effective, some patients may receive a prescription for a home UV unit. These patients are carefully monitored and must see a dermatologist for skin checkups.