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- $Unique_ID{BRK01305}
- $Pretitle{}
- $Title{Can You Tell Me About the Magic Light Used to Diagnose Skin Rash?}
- $Subject{skin rash diagnosis wood's light special procedures laboratory tests
- magic lights lamp wood black ultraviolet radiation fluoresce glow rashes lab
- test procedure uv }
- $Volume{L-20, P-20}
- $Log{}
-
- Copyright (c) 1991-92,1993 Tribune Media Services, Inc.
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- Can You Tell Me About the Magic Light Used to Diagnose Skin Rash?
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- QUESTION: Although many doctors were unable to diagnose my very peculiar skin
- rash, I finally met a doctor with a new gimmick that did the trick. He took
- me in a dark room, and used a special light on me that made the rash glow in
- the dark. Within a few seconds he had the answer I had spent months looking
- for. Now, can you tell me about that magic light? I am afraid that my doctor
- was better at using the lamp than explaining how it works, so it is up to you.
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- ANSWER: The name of the "magic lamp" is a Wood's Light, that produces black
- light that is invisible to the eye. Using a mercury vapor source, the light
- passes through a special nickel-chromium oxide silica filter that transmits
- long wave ultraviolet radiation. Certain materials as well as fungi and
- bacteria (including Pseudomonas) "fluoresce" or glow under this light, and can
- be easily detected. The same light is responsible for many special effects
- used in theatrical productions. This technique is useful in recognizing the
- differences in skin pigmentation, as well as pigmented lesions. Many of the
- organisms fluoresce in different colors, with tinea versicolor showing up a
- golden yellow, and pseudomonas ranging from aqua-green to blue. The screening
- works best if the patient has avoided bathing for 24 hours, and when the room
- is totally dark. Once the Wood's light has detected the problem, other tests
- may be used to clinch the diagnosis.
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- The material contained here is "FOR INFORMATION ONLY" and should not replace
- the counsel and advice of your personal physician. Promptly consulting your
- doctor is the best path to a quick and successful resolution of any medical
- problem.
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