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.
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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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Logical Images, Inc. editorial staff: Ramsey Markus, MD and Blanca Ochoa, MD

Last Modified: 22 Dec 2008