A Wood's lamp examination is a test that uses ultraviolet (UV) light to look at the skin closely.
Black light test; Ultraviolet light test
How the Test is Performed
You sit in a dark room for this test. The test is usually done in a skin doctor's (dermatologist) office. The doctor will turn on the Wood's lamp and hold it 4 to 5 inches from the skin to look for color changes.
How to Prepare for the Test
You do not need to take any special steps before this test. Follow your doctor's instructions about not putting creams or medicines on the area of the skin before the test.
How the Test will Feel
You will have no discomfort during this test.
Why the Test is Performed
This test is done to look for skin problems including:
Richard J. Moskowitz, MD, Dermatologist in Private Practice, Mineola, NY. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.