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</noscript></div><div class="main"><div id="ency_summary"><p>A Wood lamp examination is a test that uses ultraviolet (UV) light to look at the skin closely.</p></div><section><div class="section"><div class="section-header"><div class="section-title"><h2>How the Test Is Performed</h2></div><div class="section-button"><button type="submit" aria-controls="section-1" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-1"><p>You sit in a dark room for this test. The test is usually done in a skin doctor's (dermatologist's) office. The doctor will turn on the Wood lamp and hold it 4 to 5 inches (10 to 12.5 centimeters) from the skin to look for color changes.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>How to Prepare for the Test</h2></div><div class="section-button"><button type="submit" aria-controls="section-2" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-2"><p>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.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>How the Test will Feel</h2></div><div class="section-button"><button type="submit" aria-controls="section-3" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-3"><p>You will have no discomfort during this test.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Why the Test Is Performed</h2></div><div class="section-button"><button type="submit" aria-controls="section-4" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-4"><p>This test is done to look for skin problems including:</p><ul><li>Bacterial infections</li><li>Fungal infections</li><li><a test="test" href="./001208.htm">Porphyria</a> (an inherited disorder that causes rashes, blistering, and scarring of the skin)</li><li>Skin coloring changes, such as <a test="test" href="./000831.htm">vitiligo</a> and some skin cancers</li></ul><p>Not all types of bacteria and fungi show up under the light.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Normal Results</h2></div><div class="section-button"><button type="submit" aria-controls="section-5" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-5"><p>Normally the skin will not shine under the ultraviolet light.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>What Abnormal Results Mean</h2></div><div class="section-button"><button type="submit" aria-controls="section-6" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-6"><p>A Wood lamp exam may help your doctor confirm a fungal or bacterial infection or diagnose vitiligo. Your doctor may also be able to learn what is causing any light- or dark-colored spots on your skin.</p><p>The following things can change the results of the test:</p><ul><li>Washing your skin before the test (may cause a false-negative result)</li><li>A room that is not dark enough</li><li>Other materials that glow under the light, such as some deodorants, make-up, soaps, and sometimes lint </li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Risks</h2></div><div class="section-button"><button type="submit" aria-controls="section-7" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-7"><p>DO NOT look directly into the ultraviolet light, as the light may harm the eye.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Alternative Names</h2></div><div class="section-button"><button type="submit" aria-controls="section-Alt" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Alt"><p>Black light test; Ultraviolet light test</p></div></div></section><section><div class="section sec-mb"><div class="section-header"><div class="section-title"><h2>Images</h2></div><div class="section-button"><button type="submit" aria-controls="section-tnails" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/2096t.jpg" alt="Wood's lamp test - of the scalp" title="Wood's lamp test - of the scalp" class="side-img"/><a href="../imagepages/2096.htm">Wood's lamp test - of the scalp</a></li>
<li><img src="//medlineplus.gov/ency/images/ency/tnails/9846t.jpg" alt="Wood's lamp illumination" title="Wood's lamp illumination" class="side-img"/><a href="../imagepages/9846.htm">Wood's lamp illumination</a></li>
</ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>References</h2></div><div class="section-button"><button type="submit" aria-controls="section-Ref" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Ref"><p>Dinulos JGH. Light-related diseases and disorders of pigmentation. In: Dinulos JGH, ed. <em>Habif's Clinical Dermatology: A Color Guide to Diagnosis and Therapy</em>. 7th ed. Philadelphia, PA: Elsevier; 2021:chap 19.</p><p>Spates ST. Diagnostic techniques. In: High WA, Prok LD, eds. <em>Dermatology Secrets</em>. 6th ed. Philadelphia, PA: Elsevier; 2021:chap 3.</p></div></div></section>
<section><div class="section"><div class="section-header"><div class="section-title"><h2>Review Date 11/30/2022</h2></div><div class="section-button"><button type="submit" aria-controls="section-version" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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<div id="section-version" class="section-body"><p>Updated by: Ramin Fathi, MD, FAAD, Director, Phoenix Surgical Dermatology Group, Phoenix, AZ. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.</p>
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