A Wood's lamp examination is a test that uses ultraviolet light to closely look at the skin.
Black light test; Ultraviolet light test
The test is done while you are seated in a dark room, usually in a dermatologist's office. The health care provider turns on the Wood's lamp, holds it 4 to 5 inches from the area of skin being studied, and looks for any skin color changes.
You should not look directly into the light.
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Source: ADAM Encyclopedia
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