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</div><div><span>Polymorphous light eruption</span></div></div>
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<article><div id="d-article"><div class="page-info"><div class="page-title"><a name="start" id="start">
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</a><h1 class="with-also" itemprop="name">Polymorphous light eruption</h1>
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</noscript></div><div class="main"><div id="ency_summary"><p>Polymorphous light eruption (PMLE) is a common skin reaction in people who are sensitive to sunlight (ultraviolet light).</p></div><section><div class="section"><div class="section-header"><div class="section-title"><h2>Causes</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>The exact cause of PMLE is unknown. However, it may be genetic. Health care providers think it is a type of delayed <a test="test" href="./000005.htm">allergic reaction</a>. It is common among young women who live in moderate (temperate) climates.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Symptoms</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>Polymorphous means taking on different forms, and eruption means rash. As the name suggests, symptoms of PMLE are rash-like and are different in different people. </p><p>PMLE most often occurs in spring and early summer on areas of the body exposed to the sun.</p><p>Symptoms usually appear within 1 to 4 days after exposure to sunlight. They include any of the following:</p><ul><li>Small bumps (<a test="test" href="./003233.htm">papules</a>) or <a test="test" href="./003939.htm">blisters</a></li><li>Redness or scaling of the skin</li><li>Itching or burning of the affected skin</li><li>Swelling, or even blisters (not often seen)</li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Exams and Tests</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>Your provider will examine your skin. Usually, your provider can diagnose PMLE based on your description of the symptoms.</p><p>Tests that may be done include:</p><ul><li>Phototesting, during which your skin is exposed to special ultraviolet light to check if your skin develops a rash</li><li>Removing a small amount of skin for examination <a test="test" href="./003840.htm">skin biopsy</a> to rule out other diseases</li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Treatment</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>Steroid creams or ointments containing vitamin D may be prescribed by your provider. They are used 2 or 3 times a day at the start of the eruption. Steroid or other types of pills may be used for more severe cases.</p><p>Phototherapy may also be prescribed. Phototherapy is a medical treatment in which your skin is carefully exposed to ultraviolet light. This may help your skin become used to (sensitized to) the sun.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Outlook (Prognosis)</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>Many people become less sensitive to sunlight over time.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>When to Contact a Medical Professional</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>Call for an appointment with your provider if PMLE symptoms do not respond to treatments.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Prevention</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><a test="test" href="../patientinstructions/000378.htm">Protecting your skin from the sun</a> can help prevent PMLE symptoms:</p><ul><li>Avoid sun exposure during hours of peak sun ray intensity.</li><li>Use sunscreen. Sun protection with broad spectrum sunblock that works against UVA rays is important.</li><li>Apply generous amounts of sunscreen with a sun protection factor (SPF) of at least 30. Pay special attention to your face, nose, ears, and shoulders.</li><li>Apply sunscreen 30 minutes before sun exposure so that it has time to penetrate the skin. Re-apply after swimming and every 2 hours while you are outdoors.</li><li>Wear a sun hat.</li><li>Wear sunglasses with UV protection.</li><li>Use a lip balm with sunscreen.</li></ul></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>Polymorphic light eruption; Photodermatosis; PMLE; Benign summer light eruption<br/></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/2725t.jpg" alt="Polymorphic light eruption on the arm" title="Polymorphic light eruption on the arm" class="side-img"/><a href="../imagepages/2725.htm">Polymorphic light eruption on the arm</a></li>
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</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>Ling TC. Polymorphic light eruption. In: Lebwohl MG, Heymann WR, Coulson IH, Murrell DF, eds. <em>Treatment of Skin Disease: Comprehensive Therapeutic Strategies</em>. 6th ed. Philadelphia, PA: Elsevier; 2022:chap 196.</p><p>Patterson JW. Reactions to physical agents. In: Patterson JW, ed. <em>Weedon's Skin Pathology</em>. 5th ed. Philadelphia, PA: Elsevier Limited; 2021:chap 22.</p></div></div></section>
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<section><div class="section"><div class="section-header"><div class="section-title"><h2>Review Date 6/7/2023</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: Elika Hoss, MD, Assistant Professor of Dermatology, Mayo Clinic, Scottsdale, 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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