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Heliotherapy is the use of light to treat disease. The source of the light is sunlight or sunlamps or indoor tanning beds. A doctor uses heliotherapy to treat the symptoms of psoriasis, acne, and other conditions. A doctor suggests on how much light a patient needs and prescribes a daily regime.
A physical condition is not the only use for heliotherapy. Patient A feels sad or depressed during the winter months. He has Seasonal Affective Disorder. Doctors think the lack of sunlight is the source of the problem. Doctors prescribe heliotherapy to introduce more sunlight into the patient's environment. With more sunlight, the patient feels better.