Image in medicine
Erythrasma and the role of Wood's light: A simple diagnosis pearl
Eritrasma y el rol de la luz de Wood: una herramienta diagnóstica valiosa
Christian Robles-Silvaa, Leonel Hidalgoa,
, Cristián Vera-Kelleta,b, Cristián Navarrete-Dechenta,c
Corresponding author
a Department of Dermatology, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
b Connective Tissue Diseases Unit, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
c Melanoma and Skin Cancer Unit, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
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On clinical examination, erythematous plaques were seen on the toes. Under Wood's lamp, they exhibited coral-red fluorescence (<a class="elsevierStyleCrossRefs" href="#fig0005">Figs. 1B and 2</a>, green arrows). The findings were consistent with interdigital erythrasma, and the patients were started with a single dose of 1g-clarithromycin orally, and topical 1%-clindamycin, obtaining complete response at the 1-month follow-up (<a class="elsevierStyleCrossRef" href="#fig0005">Fig. 1</a>C).</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><elsevierMultimedia ident="fig0010"></elsevierMultimedia><p id="par0010" class="elsevierStylePara elsevierViewall">Erythrasma is a superficial skin infection caused by <span class="elsevierStyleItalic">Corynebacterium minutissimum</span>, a gram-positive aerobic or facultatively anaerobic bacteria. It presents with red-brown flaky patches and usually affects the moist intertriginous areas, such as armpits, inguinal folds, and between the toes. Interdigital erythrasma can easily be confused with tinea pedis and be treated with antifungals, obtaining poor response, with unnecessary costs.</p><p id="par0015" class="elsevierStylePara elsevierViewall">Wood's lamp examination is a simple, cheap, and harmless bedside examination that narrows the differential diagnosis in erythrasma. It uses 320–450<span class="elsevierStyleHsp" style=""></span>nm ultraviolet light coupled to a magnifying glass. With Wood's light, a characteristic coral-red-fluorescence is observed, due to accumulation of coproporphyrin III produced by <span class="elsevierStyleItalic">Corynebacterium minutissimum.</span> We emphasize the role of Wood's light as a simple tool for improving diagnosis on daily clinical routine.</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Authors’ contributions</span><p id="par0025" class="elsevierStylePara elsevierViewall">Christian Robles-Silva, Leonel Hidalgo, Cristián Vera-Kellet, Cristián Navarrete-Dechent – acquisition, analysis, and interpretation of data; drafting and revising the article; final approval of the version to be published.</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Reprint requests</span><p id="par0060" class="elsevierStylePara elsevierViewall">Leonel Hidalgo, MD.</p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Ethical considerations</span><p id="par0065" class="elsevierStylePara elsevierViewall">The acquisition of images follows the framework of protocol #211213001, reviewed and approved by the IRB: Scientific Ethical Committee of Health Sciences of the Pontificia Universidad Católica de Chile. Also, the patients in this manuscript have given written informed consent to publication, and its privacy was respected.</p><p id="par0070" class="elsevierStylePara elsevierViewall">This paper and its photos are original and have not been simultaneously submitted to another journal.</p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0020">Funding sources</span><p id="par0075" class="elsevierStylePara elsevierViewall">None.</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Conflicts of interest</span><p id="par0080" class="elsevierStylePara elsevierViewall">None declared.</p></span></span>" "textoCompletoSecciones" => array:1 [ "secciones" => array:5 [ 0 => array:2 [ "identificador" => "sec0005" "titulo" => "Authors’ contributions" ] 1 => array:2 [ "identificador" => "sec0010" "titulo" => "Reprint requests" ] 2 => array:2 [ "identificador" => "sec0015" "titulo" => "Ethical considerations" ] 3 => array:2 [ "identificador" => "sec0020" "titulo" => "Funding sources" ] 4 => array:2 [ "identificador" => "sec0025" "titulo" => "Conflicts of interest" ] ] ] "pdfFichero" => "main.pdf" "tienePdf" => true "multimedia" => array:2 [ 0 => array:6 [ "identificador" => "fig0005" "etiqueta" => "Fig. 1" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr1.jpeg" "Alto" => 639 "Ancho" => 1501 "Tamanyo" => 129204 ] ] ] 1 => array:6 [ "identificador" => "fig0010" "etiqueta" => "Fig. 2" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr2.jpeg" "Alto" => 724 "Ancho" => 1050 "Tamanyo" => 84219 ] ] ] ] ] "idiomaDefecto" => "en" "url" => "/23870206/0000016100000007/v2_202311091450/S2387020623003807/v2_202311091450/en/main.assets" "Apartado" => array:4 [ "identificador" => "51820" "tipo" => "SECCION" "en" => array:2 [ "titulo" => "Images in medicine" "idiomaDefecto" => true ] "idiomaDefecto" => "en" ] "PDF" => "https://static.elsevier.es/multimedia/23870206/0000016100000007/v2_202311091450/S2387020623003807/v2_202311091450/en/main.pdf?idApp=UINPBA00004N&text.app=https://www.elsevier.es/" "EPUB" => "https://multimedia.elsevier.es/PublicationsMultimediaV1/item/epub/S2387020623003807?idApp=UINPBA00004N" ]
