The Wood’s lamp examination is simply ultraviolet light used to show fluorescence, as in this photograph. The pink signifies the presence of bacteria causing erythrasma. A Wood’s lamp can show subtle skin pigment differences that would otherwise be very difficult to see in normal lighting. A Wood's lamp, as shown here, is used in a dark room and emits UVA light.
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Wood's Lamp Examination 

Picture of Wood's Lamp Examination: The Wood’s lamp examination is simply ultraviolet light used to show fluorescence, as in this photograph. The pink signifies the presence of bacteria causing erythrasma. Divider line
The Wood’s lamp examination is simply ultraviolet light used to show fluorescence, as in this photograph. The pink signifies the presence of bacteria causing erythrasma.
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Risks or Side Effects
Patients should avoid looking directly into the UV light. Given the brief amount of time (usually seconds) needed to shine the light on the affected skin, the risks of a Wood's lamp examination are minimal to none, and the procedure is well tolerated, as there is no pain associated with the procedure and no side effects as a result.

The presence of other materials that glow (eg, certain makeup and deodorant) or the room not being dark enough may alter the results of the exam. It is important for patients to know that not all infections can be detected by this procedure.
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Last Modified: 22 Dec 2008
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